diff --git a/mobile/app/(tabs)/_layout.tsx b/mobile/app/(tabs)/_layout.tsx
index 74e8711..dd0adac 100644
--- a/mobile/app/(tabs)/_layout.tsx
+++ b/mobile/app/(tabs)/_layout.tsx
@@ -1,5 +1,6 @@
 import { NativeTabs } from 'expo-router/unstable-native-tabs';
 import { useWindowDimensions } from 'react-native';
+import { useTranslation } from 'react-i18next';
 
 import { alpha, colors } from '@/theme';
 
@@ -7,6 +8,7 @@ export const tabLabelFontSize = (fontScale: number) => 12 / Math.max(fontScale,
 
 export default function TabsLayout() {
   const { fontScale } = useWindowDimensions();
+  const { t } = useTranslation();
   const fontSize = tabLabelFontSize(fontScale);
   const labelStyle = {
     default: {
@@ -33,25 +35,25 @@ export default function TabsLayout() {
       labelStyle={labelStyle}
       labelVisibilityMode="labeled"
       tintColor={colors.action}>
-      <NativeTabs.Trigger accessibilityLabel="Today" name="today" testID="tab-today">
+      <NativeTabs.Trigger accessibilityLabel={t('tabs.today')} name="today" testID="tab-today">
         <NativeTabs.Trigger.Icon md="calendar_today" sf="calendar" />
-        <NativeTabs.Trigger.Label>Today</NativeTabs.Trigger.Label>
+        <NativeTabs.Trigger.Label>{t('tabs.today')}</NativeTabs.Trigger.Label>
       </NativeTabs.Trigger>
-      <NativeTabs.Trigger accessibilityLabel="Pantry" name="pantry" testID="tab-pantry">
+      <NativeTabs.Trigger accessibilityLabel={t('tabs.pantry')} name="pantry" testID="tab-pantry">
         <NativeTabs.Trigger.Icon md="inventory_2" sf="cabinet" />
-        <NativeTabs.Trigger.Label>Pantry</NativeTabs.Trigger.Label>
+        <NativeTabs.Trigger.Label>{t('tabs.pantry')}</NativeTabs.Trigger.Label>
       </NativeTabs.Trigger>
-      <NativeTabs.Trigger accessibilityLabel="Rescue" name="rescue" testID="tab-rescue">
+      <NativeTabs.Trigger accessibilityLabel={t('tabs.rescue')} name="rescue" testID="tab-rescue">
         <NativeTabs.Trigger.Icon md="restaurant" sf="fork.knife" />
-        <NativeTabs.Trigger.Label>Rescue</NativeTabs.Trigger.Label>
+        <NativeTabs.Trigger.Label>{t('tabs.rescue')}</NativeTabs.Trigger.Label>
       </NativeTabs.Trigger>
-      <NativeTabs.Trigger accessibilityLabel="Insights" name="insights" testID="tab-insights">
+      <NativeTabs.Trigger accessibilityLabel={t('tabs.insights')} name="insights" testID="tab-insights">
         <NativeTabs.Trigger.Icon md="insights" sf={{ default: 'chart.bar', selected: 'chart.bar.fill' }} />
-        <NativeTabs.Trigger.Label>Insights</NativeTabs.Trigger.Label>
+        <NativeTabs.Trigger.Label>{t('tabs.insights')}</NativeTabs.Trigger.Label>
       </NativeTabs.Trigger>
-      <NativeTabs.Trigger accessibilityLabel="Settings" name="settings" testID="tab-settings">
+      <NativeTabs.Trigger accessibilityLabel={t('tabs.settings')} name="settings" testID="tab-settings">
         <NativeTabs.Trigger.Icon md="settings" sf={{ default: 'gearshape', selected: 'gearshape.fill' }} />
-        <NativeTabs.Trigger.Label>Settings</NativeTabs.Trigger.Label>
+        <NativeTabs.Trigger.Label>{t('tabs.settings')}</NativeTabs.Trigger.Label>
       </NativeTabs.Trigger>
     </NativeTabs>
   );
diff --git a/mobile/app/_layout.tsx b/mobile/app/_layout.tsx
index 84033b1..6088bd2 100644
--- a/mobile/app/_layout.tsx
+++ b/mobile/app/_layout.tsx
@@ -1,12 +1,16 @@
 import { useNetworkState } from 'expo-network';
 import { Redirect, Stack, ThemeProvider, usePathname } from 'expo-router';
 import { StatusBar } from 'expo-status-bar';
-import { useEffect } from 'react';
+import { useEffect, useState } from 'react';
+import { I18nextProvider } from 'react-i18next';
 import { GestureHandlerRootView } from 'react-native-gesture-handler';
 
 import { initializeNotifications } from '@/services/notifications';
 import { AppErrorBoundary } from '@/application/AppErrorBoundary';
 import { OfflineStatusBanner } from '@/application/OfflineStatusBanner';
+import { getFreshLoopDatabase } from '@/data/database/expo-sqlite';
+import { SettingsRepository } from '@/data/repositories/settings';
+import i18next, { initI18n } from '@/i18n';
 import { alpha, colors, useFreshLoopFonts } from '@/theme';
 
 export { AppErrorBoundary as ErrorBoundary };
@@ -33,41 +37,61 @@ export default function RootLayout() {
   useFreshLoopFonts();
   const pathname = usePathname();
   const networkState = useNetworkState();
+  const [i18nReady, setI18nReady] = useState(false);
 
   useEffect(() => {
     void initializeNotifications().catch(() => undefined);
   }, []);
 
+  useEffect(() => {
+    let cancelled = false;
+    void (async () => {
+      try {
+        const db = await getFreshLoopDatabase();
+        const store = new SettingsRepository(db);
+        await initI18n(store);
+      } catch {
+        await initI18n();
+      }
+      if (!cancelled) setI18nReady(true);
+    })();
+    return () => { cancelled = true; };
+  }, []);
+
   if (pathname === '/explore') {
     return <Redirect href="/today" />;
   }
 
   return (
-    <GestureHandlerRootView style={{ flex: 1 }}>
-      <ThemeProvider value={freshLoopNavigationTheme}>
-        <StatusBar style="dark" />
-        <OfflineStatusBanner
-          isConnected={networkState.isConnected}
-          isInternetReachable={networkState.isInternetReachable}
-        />
-        <Stack
-          screenOptions={{
-            contentStyle: { backgroundColor: colors.canvas },
-            headerBackButtonDisplayMode: 'minimal',
-            headerStyle: { backgroundColor: colors.canvas },
-            headerTintColor: colors.text,
-            headerTitleStyle: { fontFamily: 'Manrope-Bold', fontWeight: '700' },
-          }}>
-          <Stack.Screen name="index" options={{ headerShown: false }} />
-          <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
-          <Stack.Screen name="item/add" options={{ title: 'Add item' }} />
-          <Stack.Screen name="item/scan" options={{ title: 'Add item' }} />
-          <Stack.Screen name="item/[id]" options={{ title: 'Item detail' }} />
-          <Stack.Screen name="item/[id]/edit" options={{ title: 'Edit item' }} />
-          <Stack.Screen name="item/gallery" options={{ title: 'Component gallery' }} />
-          <Stack.Screen name="recipe/[id]" options={{ title: 'Recipe detail' }} />
-        </Stack>
-      </ThemeProvider>
-    </GestureHandlerRootView>
+    <I18nextProvider i18n={i18next}>
+      <GestureHandlerRootView style={{ flex: 1 }}>
+        <ThemeProvider value={freshLoopNavigationTheme}>
+          <StatusBar style="dark" />
+          {i18nReady ? (
+            <OfflineStatusBanner
+              isConnected={networkState.isConnected}
+              isInternetReachable={networkState.isInternetReachable}
+            />
+          ) : null}
+          <Stack
+            screenOptions={{
+              contentStyle: { backgroundColor: colors.canvas },
+              headerBackButtonDisplayMode: 'minimal',
+              headerStyle: { backgroundColor: colors.canvas },
+              headerTintColor: colors.text,
+              headerTitleStyle: { fontFamily: 'Manrope-Bold', fontWeight: '700' },
+            }}>
+            <Stack.Screen name="index" options={{ headerShown: false }} />
+            <Stack.Screen name="(tabs)" options={{ headerShown: false }} />
+            <Stack.Screen name="item/add" options={{ title: 'Add item' }} />
+            <Stack.Screen name="item/scan" options={{ title: 'Add item' }} />
+            <Stack.Screen name="item/[id]" options={{ title: 'Item detail' }} />
+            <Stack.Screen name="item/[id]/edit" options={{ title: 'Edit item' }} />
+            <Stack.Screen name="item/gallery" options={{ title: 'Component gallery' }} />
+            <Stack.Screen name="recipe/[id]" options={{ title: 'Recipe detail' }} />
+          </Stack>
+        </ThemeProvider>
+      </GestureHandlerRootView>
+    </I18nextProvider>
   );
 }
diff --git a/mobile/jest.config.js b/mobile/jest.config.js
index 5d10984..2c88875 100644
--- a/mobile/jest.config.js
+++ b/mobile/jest.config.js
@@ -1,4 +1,5 @@
 module.exports = {
   preset: 'jest-expo',
   testPathIgnorePatterns: ['/node_modules/', '/android/', '/ios/'],
+  setupFiles: ['./jest.setup.ts'],
 };
diff --git a/mobile/jest.setup.ts b/mobile/jest.setup.ts
new file mode 100644
index 0000000..d895b96
--- /dev/null
+++ b/mobile/jest.setup.ts
@@ -0,0 +1,30 @@
+import i18next from 'i18next';
+import { initReactI18next } from 'react-i18next';
+
+import en from './src/i18n/locales/en.json';
+
+void i18next.use(initReactI18next).init({
+  compatibilityJSON: 'v4',
+  resources: { en: { translation: en } },
+  lng: 'en',
+  fallbackLng: 'en',
+  interpolation: { escapeValue: false },
+  returnNull: false,
+  returnEmptyString: false,
+});
+
+// Global mock for react-i18next to avoid wrapping every test in I18nextProvider.
+// useTranslation() will use the pre-initialised i18next instance above.
+// Jest requires `mock` prefix for out-of-scope references in jest.mock factories.
+const mockI18next = i18next;
+jest.mock('react-i18next', () => {
+  // eslint-disable-next-line @typescript-eslint/no-require-imports
+  const actual = jest.requireActual('react-i18next');
+  return {
+    ...actual,
+    useTranslation: () => ({
+      t: (key: string, opts?: Record<string, unknown>) => mockI18next.t(key, opts ?? {}),
+      i18n: { language: 'en', changeLanguage: jest.fn() },
+    }),
+  };
+});
diff --git a/mobile/package-lock.json b/mobile/package-lock.json
index 0afaabe..a359df5 100644
--- a/mobile/package-lock.json
+++ b/mobile/package-lock.json
@@ -20,6 +20,7 @@
         "expo-glass-effect": "~57.0.1",
         "expo-image": "~57.0.1",
         "expo-linking": "~57.0.3",
+        "expo-localization": "^57.0.1",
         "expo-network": "~57.0.1",
         "expo-notifications": "~57.0.5",
         "expo-router": "~57.0.6",
@@ -29,9 +30,11 @@
         "expo-symbols": "~57.0.1",
         "expo-system-ui": "~57.0.1",
         "expo-web-browser": "~57.0.1",
+        "i18next": "^26.3.6",
         "ky": "^2.0.2",
         "react": "19.2.3",
         "react-dom": "19.2.3",
+        "react-i18next": "^17.0.11",
         "react-native": "0.86.0",
         "react-native-gesture-handler": "~2.32.0",
         "react-native-reanimated": "4.5.0",
@@ -4254,9 +4257,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4271,9 +4271,6 @@
         "arm64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4288,9 +4285,6 @@
         "loong64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4305,9 +4299,6 @@
         "loong64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4322,9 +4313,6 @@
         "ppc64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4339,9 +4327,6 @@
         "riscv64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4356,9 +4341,6 @@
         "riscv64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4373,9 +4355,6 @@
         "s390x"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4390,9 +4369,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "glibc"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -4407,9 +4383,6 @@
         "x64"
       ],
       "dev": true,
-      "libc": [
-        "musl"
-      ],
       "license": "MIT",
       "optional": true,
       "os": [
@@ -7482,6 +7455,19 @@
         "react-native": "*"
       }
     },
+    "node_modules/expo-localization": {
+      "version": "57.0.1",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/expo-localization/-/expo-localization-57.0.1.tgz",
+      "integrity": "sha512-8Ffl4UTbOsQeGT0v5fxMbyPHyPMPnhSPDFQJa8p9rjJrthFoAtNi+fL6Ssmrvf1/7dmPq1mVY52MEt0TMEfgjA==",
+      "license": "MIT",
+      "dependencies": {
+        "rtl-detect": "^1.0.2"
+      },
+      "peerDependencies": {
+        "expo": "*",
+        "react": "*"
+      }
+    },
     "node_modules/expo-modules-autolinking": {
       "version": "57.0.7",
       "resolved": "https://registry.npmjs.org/expo-modules-autolinking/-/expo-modules-autolinking-57.0.7.tgz",
@@ -8255,6 +8241,7 @@
       "version": "2.3.3",
       "resolved": "https://registry.npmjs.org/fsevents/-/fsevents-2.3.3.tgz",
       "integrity": "sha512-5xoDfX+fL7faATnagmWPpbFtwh/R77WmMMqqHGS65C3vvB0YHrgF+B1YmZ3441tMj5n63k0212XNoJwzlhffQw==",
+      "dev": true,
       "hasInstallScript": true,
       "license": "MIT",
       "optional": true,
@@ -8694,6 +8681,15 @@
       "license": "MIT",
       "peer": true
     },
+    "node_modules/html-parse-stringify": {
+      "version": "4.0.1",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/html-parse-stringify/-/html-parse-stringify-4.0.1.tgz",
+      "integrity": "sha512-0zHsZJrK7S3K2aucXWL6ycoYJ/iNtIcFHC/nYQgFklPtrv5LpJctIiSCroWZWeuoXvuyFdzp6KzjJQ+OT5MfFw==",
+      "license": "MIT",
+      "funding": {
+        "url": "https://locize.com"
+      }
+    },
     "node_modules/http-errors": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/http-errors/-/http-errors-2.0.1.tgz",
@@ -8781,6 +8777,34 @@
       "integrity": "sha512-WDC/ui2VVRrz3jOVi+XtjqkDjiVjTtFaAGiW37k6b+ohyQ5wYDOGkvCZa8+H0nx3gyvv0+BST9xuOgIyGQ00gw==",
       "license": "BSD-3-Clause"
     },
+    "node_modules/i18next": {
+      "version": "26.3.6",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/i18next/-/i18next-26.3.6.tgz",
+      "integrity": "sha512-Bu5Z2nAXgfVyM8xvW3jk9EKRIuX37PudsrBViThNFx7CR7aaYTpP01cxNB/E4c4UUzTDiAZRstEhsRfPOL/8xA==",
+      "funding": [
+        {
+          "type": "individual",
+          "url": "https://www.locize.com/i18next"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.i18next.com/how-to/faq#i18next-is-awesome.-how-can-i-support-the-project"
+        },
+        {
+          "type": "individual",
+          "url": "https://www.locize.com"
+        }
+      ],
+      "license": "MIT",
+      "peerDependencies": {
+        "typescript": "^5 || ^6 || ^7"
+      },
+      "peerDependenciesMeta": {
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/iconv-lite": {
       "version": "0.6.3",
       "resolved": "https://registry.npmjs.org/iconv-lite/-/iconv-lite-0.6.3.tgz",
@@ -11064,9 +11088,6 @@
       "cpu": [
         "arm64"
       ],
-      "libc": [
-        "glibc"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -11087,9 +11108,6 @@
       "cpu": [
         "arm64"
       ],
-      "libc": [
-        "musl"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -11110,9 +11128,6 @@
       "cpu": [
         "x64"
       ],
-      "libc": [
-        "glibc"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -11133,9 +11148,6 @@
       "cpu": [
         "x64"
       ],
-      "libc": [
-        "musl"
-      ],
       "license": "MPL-2.0",
       "optional": true,
       "os": [
@@ -12903,6 +12915,33 @@
         "react": ">=17.0.0"
       }
     },
+    "node_modules/react-i18next": {
+      "version": "17.0.11",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/react-i18next/-/react-i18next-17.0.11.tgz",
+      "integrity": "sha512-cDtkXgxjuFTWUH6V+aQn1Ve5vDiUztCNPWW5GtSHDccsgRXO1nE6QFWCEmc1KAutrb3OUv87wFShJL5RhUwPXg==",
+      "license": "MIT",
+      "dependencies": {
+        "@babel/runtime": "^7.29.2",
+        "html-parse-stringify": "^4.0.1",
+        "use-sync-external-store": "^1.6.0"
+      },
+      "peerDependencies": {
+        "i18next": ">= 26.2.0",
+        "react": ">= 16.8.0",
+        "typescript": "^5 || ^6 || ^7"
+      },
+      "peerDependenciesMeta": {
+        "react-dom": {
+          "optional": true
+        },
+        "react-native": {
+          "optional": true
+        },
+        "typescript": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/react-is": {
       "version": "19.2.7",
       "resolved": "https://registry.npmjs.org/react-is/-/react-is-19.2.7.tgz",
@@ -13460,6 +13499,12 @@
         "node": ">=4"
       }
     },
+    "node_modules/rtl-detect": {
+      "version": "1.1.2",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/rtl-detect/-/rtl-detect-1.1.2.tgz",
+      "integrity": "sha512-PGMBq03+TTG/p/cRB7HCLKJ1MgDIi07+QU1faSjiYRfmY5UsAttV9Hs08jDAHVwcOwmVLcSJkpwyfXszVjWfIQ==",
+      "license": "BSD-3-Clause"
+    },
     "node_modules/safe-array-concat": {
       "version": "1.1.4",
       "resolved": "https://registry.npmjs.org/safe-array-concat/-/safe-array-concat-1.1.4.tgz",
@@ -14983,6 +15028,15 @@
         }
       }
     },
+    "node_modules/use-sync-external-store": {
+      "version": "1.6.0",
+      "resolved": "https://mirrors.cloud.tencent.com/npm/use-sync-external-store/-/use-sync-external-store-1.6.0.tgz",
+      "integrity": "sha512-Pp6GSwGP/NrPIrxVFAIkOQeyw8lFenOHijQWkUTrDvrF4ALqylP2C/KCkeS9dpUM3KvYRQhna5vt7IL95+ZQ9w==",
+      "license": "MIT",
+      "peerDependencies": {
+        "react": "^16.8.0 || ^17.0.0 || ^18.0.0 || ^19.0.0"
+      }
+    },
     "node_modules/utils-merge": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/utils-merge/-/utils-merge-1.0.1.tgz",
diff --git a/mobile/package.json b/mobile/package.json
index 5b32c9e..a31faa9 100644
--- a/mobile/package.json
+++ b/mobile/package.json
@@ -19,6 +19,7 @@
     "expo-glass-effect": "~57.0.1",
     "expo-image": "~57.0.1",
     "expo-linking": "~57.0.3",
+    "expo-localization": "^57.0.1",
     "expo-network": "~57.0.1",
     "expo-notifications": "~57.0.5",
     "expo-router": "~57.0.6",
@@ -28,9 +29,11 @@
     "expo-symbols": "~57.0.1",
     "expo-system-ui": "~57.0.1",
     "expo-web-browser": "~57.0.1",
+    "i18next": "^26.3.6",
     "ky": "^2.0.2",
     "react": "19.2.3",
     "react-dom": "19.2.3",
+    "react-i18next": "^17.0.11",
     "react-native": "0.86.0",
     "react-native-gesture-handler": "~2.32.0",
     "react-native-reanimated": "4.5.0",
diff --git a/mobile/src/features/insights/InsightsScreen.tsx b/mobile/src/features/insights/InsightsScreen.tsx
index cf884f1..c8e7fa8 100644
--- a/mobile/src/features/insights/InsightsScreen.tsx
+++ b/mobile/src/features/insights/InsightsScreen.tsx
@@ -1,5 +1,6 @@
 import { useFocusEffect, useRouter } from 'expo-router';
 import { useCallback, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, View } from 'react-native';
 
 import { todayInHongKong } from '@/domain/dates/hong-kong-today';
@@ -40,6 +41,7 @@ export function InsightsScreen({
   currentTime = currentDate,
 }: InsightsScreenProps) {
   const router = useRouter();
+  const { t } = useTranslation();
   const [state, setState] = useState<InsightsState>({ stage: 'loading' });
 
   const load = useCallback(async () => {
@@ -62,19 +64,19 @@ export function InsightsScreen({
 
   if (state.stage === 'loading') {
     return (
-      <Screen eyebrow="Insights · 數據洞察" title="Loading recorded activity">
-        <Skeleton label="Loading Insights" />
+      <Screen eyebrow={t('insights.eyebrow')} title={t('insights.title_loading')}>
+        <Skeleton label={t('insights.loading')} />
       </Screen>
     );
   }
   if (state.stage === 'error') {
     return (
-      <Screen eyebrow="Insights · 數據洞察" title="Insights are unavailable">
+      <Screen eyebrow={t('insights.eyebrow')} title={t('insights.title_error')}>
         <ErrorState
-          description="Recorded local activity could not be read. Nothing was changed."
+          description={t('insights.error_description')}
           onRetry={() => void load()}
-          retryLabel="Retry Insights"
-          title="Could not load Insights"
+          retryLabel={t('insights.error_retry')}
+          title={t('insights.error_title')}
         />
       </Screen>
     );
@@ -84,25 +86,23 @@ export function InsightsScreen({
   const totalEvents = summary.usedCount + summary.discardedCount;
   return (
     <Screen
-      eyebrow="Insights · 數據洞察"
+      eyebrow={t('insights.eyebrow')}
       testID="insights-screen"
-      title="Observed pantry activity">
-      <AppText>
-        Recorded actions only. FreshLoop does not estimate waste prevented or convert outcomes into savings.
-      </AppText>
+      title={t('insights.title')}>
+      <AppText>{t('insights.description')}</AppText>
       <View style={styles.counts}>
-        <CountCard count={summary.activeCount} label="Currently active" />
-        <CountCard count={summary.usedCount} label="Used recorded" />
-        <CountCard count={summary.discardedCount} label="Discarded recorded" />
+        <CountCard count={summary.activeCount} label={t('insights.active_count')} />
+        <CountCard count={summary.usedCount} label={t('insights.used_count')} />
+        <CountCard count={summary.discardedCount} label={t('insights.discarded_count')} />
       </View>
       <Card>
-        <AppText role="sectionTitle">Last seven days</AppText>
+        <AppText role="sectionTitle">{t('insights.last_seven_days')}</AppText>
         {totalEvents === 0 ? (
-          <AppText>No outcomes recorded yet. The chart remains at zero until you record an action.</AppText>
+          <AppText>{t('insights.no_outcomes')}</AppText>
         ) : null}
         <OutcomeBars days={summary.sevenDayOutcomes} />
       </Card>
-      <Button label="Return to Today" onPress={() => router.replace('/today')} variant="secondary" />
+      <Button label={t('insights.return_today')} onPress={() => router.replace('/today')} variant="secondary" />
     </Screen>
   );
 }
diff --git a/mobile/src/features/onboarding/OnboardingScreen.tsx b/mobile/src/features/onboarding/OnboardingScreen.tsx
index 756e247..0678ddd 100644
--- a/mobile/src/features/onboarding/OnboardingScreen.tsx
+++ b/mobile/src/features/onboarding/OnboardingScreen.tsx
@@ -1,3 +1,4 @@
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, View } from 'react-native';
 
 import { colors, spacing } from '@/theme';
@@ -20,10 +21,11 @@ export function OnboardingScreen({
   onStartEmpty,
   onRetry,
 }: OnboardingScreenProps) {
+  const { t } = useTranslation();
   const busy = pendingChoice !== null;
 
   return (
-    <Screen eyebrow="Private by default" testID="onboarding-screen" title="Welcome to FreshLoop">
+    <Screen eyebrow={t('onboarding.eyebrow')} testID="onboarding-screen" title={t('onboarding.title')}>
       <Card>
         <View style={styles.cardHeader}>
           <AppIcon
@@ -33,11 +35,11 @@ export function OnboardingScreen({
             tintColor={colors.action}
           />
           <AppText role="sectionTitle" style={styles.cardTitle}>
-            Your pantry stays on this device
+            {t('onboarding.privacy_title')}
           </AppText>
         </View>
         <AppText style={styles.cardDescription}>
-          No login, cloud account, or network connection is required for the core pantry.
+          {t('onboarding.privacy_description')}
         </AppText>
       </Card>
       <Card>
@@ -49,24 +51,24 @@ export function OnboardingScreen({
             tintColor={colors.action}
           />
           <AppText role="sectionTitle" style={styles.cardTitle}>
-            Dates guide what to check
+            {t('onboarding.dates_title')}
           </AppText>
         </View>
         <AppText style={styles.cardDescription}>
-          Use By and Best Before mean different things. FreshLoop explains the date basis but never declares food safe.
+          {t('onboarding.dates_description')}
         </AppText>
       </Card>
       {errorMessage !== undefined && onRetry !== undefined ? (
         <ErrorState
           description={errorMessage}
           onRetry={onRetry}
-          retryLabel="Try again"
-          title="FreshLoop could not finish setup"
+          retryLabel={t('onboarding.error_retry')}
+          title={t('onboarding.error_title')}
         />
       ) : null}
       <Button
         disabled={busy && pendingChoice !== 'import_demo'}
-        label="Import Demo Data"
+        label={t('onboarding.import_demo')}
         loading={pendingChoice === 'import_demo'}
         onPress={onImportDemo}
         testID="onboarding-import-demo"
@@ -74,7 +76,7 @@ export function OnboardingScreen({
 
       <Button
         disabled={busy && pendingChoice !== 'start_empty'}
-        label="Start Empty"
+        label={t('onboarding.start_empty')}
         loading={pendingChoice === 'start_empty'}
         onPress={onStartEmpty}
         testID="onboarding-start-empty"
diff --git a/mobile/src/features/pantry/PantryScreen.tsx b/mobile/src/features/pantry/PantryScreen.tsx
index bc9a6b7..79bd516 100644
--- a/mobile/src/features/pantry/PantryScreen.tsx
+++ b/mobile/src/features/pantry/PantryScreen.tsx
@@ -1,5 +1,6 @@
 import { useFocusEffect, useRouter } from 'expo-router';
 import { useCallback, useMemo, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, View } from 'react-native';
 
 import type { FoodItem, FoodItemStatus } from '@/domain/items/types';
@@ -32,12 +33,14 @@ type PantryScreenProps = {
 
 type LoadStage = 'loading' | 'ready' | 'error';
 
-const STATUS_OPTIONS: readonly ChoiceOption<FoodItemStatus | 'all'>[] = [
-  { label: 'All', value: 'all' },
-  { label: 'Active', value: 'active' },
-  { label: 'Used', value: 'used' },
-  { label: 'Discarded', value: 'discarded' },
-];
+function useStatusOptions(t: (key: string) => string): readonly ChoiceOption<FoodItemStatus | 'all'>[] {
+  return [
+    { label: t('common.all'), value: 'all' },
+    { label: t('common.active'), value: 'active' },
+    { label: t('common.used'), value: 'used' },
+    { label: t('common.discarded'), value: 'discarded' },
+  ];
+}
 
 const INITIAL_FILTERS: PantryFilters = {
   search: '',
@@ -46,9 +49,9 @@ const INITIAL_FILTERS: PantryFilters = {
   status: 'all',
 };
 
-function optionsFor(values: readonly string[]): readonly ChoiceOption<string>[] {
+function optionsFor(values: readonly string[], tAll: string): readonly ChoiceOption<string>[] {
   return [
-    { label: 'All', value: 'all' },
+    { label: tAll, value: 'all' },
     ...[...new Set(values)].sort().map((value) => ({ label: value, value })),
   ];
 }
@@ -66,9 +69,11 @@ function badgeFor(item: FoodItem): 'unknown' | 'used' | 'discarded' {
 
 export function PantryScreen({ loadService = openPantryService }: PantryScreenProps) {
   const router = useRouter();
+  const { t } = useTranslation();
   const [stage, setStage] = useState<LoadStage>('loading');
   const [items, setItems] = useState<readonly FoodItem[]>([]);
   const [filters, setFilters] = useState<PantryFilters>(INITIAL_FILTERS);
+  const STATUS_OPTIONS = useStatusOptions(t);
 
   const load = useCallback(async () => {
     setStage('loading');
@@ -89,68 +94,68 @@ export function PantryScreen({ loadService = openPantryService }: PantryScreenPr
 
   const visibleItems = useMemo(() => filterPantryItems(items, filters), [filters, items]);
   const categoryOptions = useMemo(
-    () => optionsFor(items.map(({ category }) => category)),
-    [items],
+    () => optionsFor(items.map(({ category }) => category), t('common.all')),
+    [items, t],
   );
   const storageOptions = useMemo(
-    () => optionsFor(items.map(({ storageLocation }) => storageLocation)),
-    [items],
+    () => optionsFor(items.map(({ storageLocation }) => storageLocation), t('common.all')),
+    [items, t],
   );
 
   return (
     <Screen
-      eyebrow="Pantry · 儲藏室"
+      eyebrow={t('pantry.eyebrow')}
       testID="pantry-screen"
-      title="Everything you have">
-      <Button label="Add item" onPress={() => router.push('/item/add')} testID="pantry-add-item" />
+      title={t('pantry.title')}>
+      <Button label={t('pantry.add_item')} onPress={() => router.push('/item/add')} testID="pantry-add-item" />
       <FormField
-        accessibilityLabel="Search pantry"
-        helperText="Search English names or Traditional Chinese ingredient aliases."
-        label="Search"
+        accessibilityLabel={t('pantry.search_accessibility')}
+        helperText={t('pantry.search_helper')}
+        label={t('pantry.search_label')}
         onChangeText={(search) => setFilters((current) => ({ ...current, search }))}
         value={filters.search}
       />
       <ChoiceRow
-        label="Status"
+        label={t('pantry.filter_status')}
         onSelect={(status) => setFilters((current) => ({ ...current, status }))}
         options={STATUS_OPTIONS}
         selected={filters.status}
       />
       <ChoiceRow
-        label="Category"
+        label={t('pantry.filter_category')}
         onSelect={(category) => setFilters((current) => ({ ...current, category }))}
         options={categoryOptions}
         selected={filters.category}
       />
       <ChoiceRow
-        label="Storage"
+        label={t('pantry.filter_storage')}
         onSelect={(storageLocation) =>
           setFilters((current) => ({ ...current, storageLocation }))
         }
         options={storageOptions}
         selected={filters.storageLocation}
       />
-      {stage === 'loading' ? <Skeleton label="Loading pantry items" /> : null}
+      {stage === 'loading' ? <Skeleton label={t('pantry.loading')} /> : null}
       {stage === 'error' ? (
         <ErrorState
-          description="Local pantry data could not be read. Nothing was changed."
+          description={t('pantry.error_description')}
           onRetry={() => void load()}
-          retryLabel="Retry pantry"
-          title="Could not open Pantry"
+          retryLabel={t('pantry.error_retry')}
+          title={t('pantry.error_title')}
         />
       ) : null}
       {stage === 'ready' && visibleItems.length === 0 ? (
         <EmptyState
-          actionLabel={items.length === 0 ? 'Add your first item' : 'Clear filters'}
+          actionLabel={items.length === 0 ? t('pantry.empty_action') : t('pantry.no_match_action')}
           description={
             items.length === 0
-              ? 'Manual entry works offline and remains available without scanning.'
-              : 'No stored item matches the current search and filters.'
+              ? t('pantry.empty_description')
+              : t('pantry.no_match_description')
           }
           onAction={() =>
             items.length === 0 ? router.push('/item/add') : setFilters(INITIAL_FILTERS)
           }
-          title={items.length === 0 ? 'Your pantry is ready' : 'No matching items'}
+          title={items.length === 0 ? t('pantry.empty_title') : t('pantry.no_match_title')}
         />
       ) : null}
       {stage === 'ready' ? (
@@ -159,7 +164,7 @@ export function PantryScreen({ loadService = openPantryService }: PantryScreenPr
             const ingredient = ingredientFor(item);
             return (
               <Card
-                accessibilityLabel={`Open ${item.name} details`}
+                accessibilityLabel={t('pantry.open_item', { name: item.name })}
                 key={item.id.value}
                 onPress={() => router.push(`/item/${item.id.value}`)}
                 testID={`pantry-item-${item.id.value}`}>
diff --git a/mobile/src/features/rescue/RescueScreen.tsx b/mobile/src/features/rescue/RescueScreen.tsx
index 8775bf4..5f0fd3b 100644
--- a/mobile/src/features/rescue/RescueScreen.tsx
+++ b/mobile/src/features/rescue/RescueScreen.tsx
@@ -1,5 +1,6 @@
 import { useFocusEffect, useRouter } from 'expo-router';
 import { useCallback, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, View } from 'react-native';
 
 import { todayInHongKong } from '@/domain/dates/hong-kong-today';
@@ -31,6 +32,7 @@ export function RescueScreen({
   currentTime = currentDate,
 }: RescueScreenProps) {
   const router = useRouter();
+  const { t } = useTranslation();
   const [state, setState] = useState<RescueState>({ stage: 'loading' });
 
   const load = useCallback(async () => {
@@ -53,47 +55,47 @@ export function RescueScreen({
   );
 
   if (state.stage === 'loading') {
-    return <Screen eyebrow="Rescue · 拯救清單" title="Finding local matches"><Skeleton label="Ranking rescue recipes" /></Screen>;
+    return <Screen eyebrow={t('rescue.eyebrow')} title={t('rescue.title_loading')}><Skeleton label={t('rescue.loading')} /></Screen>;
   }
   if (state.stage === 'error') {
     return (
-      <Screen eyebrow="Rescue · 拯救清單" title="Rescue is unavailable">
-        <ErrorState description="Local pantry data could not be ranked. Nothing was changed." onRetry={() => void load()} retryLabel="Retry Rescue" title="Could not load Rescue" />
+      <Screen eyebrow={t('rescue.eyebrow')} title={t('rescue.title_error')}>
+        <ErrorState description={t('rescue.error_description')} onRetry={() => void load()} retryLabel={t('rescue.error_retry')} title={t('rescue.error_title')} />
       </Screen>
     );
   }
 
   const { view } = state;
   return (
-    <Screen eyebrow="Rescue · 拯救清單" testID="rescue-screen" title="Cook from what needs attention">
-      <AppText>Local recipes are ranked from date guidance, matched ingredients, missing ingredients, and cooking time.</AppText>
+    <Screen eyebrow={t('rescue.eyebrow')} testID="rescue-screen" title={t('rescue.title')}>
+      <AppText>{t('rescue.description')}</AppText>
       {view.blockedCount > 0 ? (
         <Card>
-          <AppText role="sectionTitle">Safety exclusions</AppText>
-          <AppText>{view.blockedCount} date-blocked {view.blockedCount === 1 ? 'item is' : 'items are'} excluded from every recipe.</AppText>
+          <AppText role="sectionTitle">{t('rescue.safety_title')}</AppText>
+          <AppText>{t(view.blockedCount === 1 ? 'rescue.safety_one' : 'rescue.safety_other', { count: view.blockedCount })}</AppText>
         </Card>
       ) : null}
       {view.conditionChecks.length > 0 ? (
         <View style={styles.section}>
-          <AppText role="sectionTitle">Check condition first</AppText>
-          <AppText>Past Best Before is quality guidance. Confirm condition on the item page; the confirmation expires at Hong Kong midnight.</AppText>
+          <AppText role="sectionTitle">{t('rescue.condition_title')}</AppText>
+          <AppText>{t('rescue.condition_description')}</AppText>
           {view.conditionChecks.map(({ item }) => (
             <Card key={item.id.value}>
-              <AppText>{`Check ${item.name} before Rescue can use it.`}</AppText>
-              <Button accessibilityLabel={`Check condition for ${item.name}`} label="Open condition check" onPress={() => router.push(`/item/${item.id.value}`)} variant="secondary" />
+              <AppText>{t('rescue.check_item', { name: item.name })}</AppText>
+              <Button accessibilityLabel={`${t('rescue.open_check')} ${item.name}`} label={t('rescue.open_check')} onPress={() => router.push(`/item/${item.id.value}`)} variant="secondary" />
             </Card>
           ))}
         </View>
       ) : null}
       {view.activeCount === 0 ? (
-        <EmptyState actionLabel="Add an item" description="Rescue only ranks active pantry items stored on this device." onAction={() => router.push('/item/add')} title="No active ingredients yet" />
+        <EmptyState actionLabel={t('rescue.empty_no_active_action')} description={t('rescue.empty_no_active_description')} onAction={() => router.push('/item/add')} title={t('rescue.empty_no_active_title')} />
       ) : null}
       {view.activeCount > 0 && view.matches.length === 0 ? (
-        <EmptyState actionLabel="Review Pantry" description="No recipe has an eligible pantry match with at most two missing non-staples. Check condition prompts or add ingredients." onAction={() => router.push('/pantry')} title="No local recipe matches yet" />
+        <EmptyState actionLabel={t('rescue.empty_no_match_action')} description={t('rescue.empty_no_match_description')} onAction={() => router.push('/pantry')} title={t('rescue.empty_no_match_title')} />
       ) : null}
       {view.matches.length > 0 ? (
         <View style={styles.section}>
-          <AppText role="sectionTitle">Ranked matches</AppText>
+          <AppText role="sectionTitle">{t('rescue.ranked_title')}</AppText>
           {view.matches.map((match) => (
             <RescueRecipeCard key={match.recipe.id.value} match={match} onPress={() => router.push(`/recipe/${match.recipe.id.value}`)} />
           ))}
diff --git a/mobile/src/features/rescue/__tests__/screens.test.tsx b/mobile/src/features/rescue/__tests__/screens.test.tsx
index d646d7a..6886b08 100644
--- a/mobile/src/features/rescue/__tests__/screens.test.tsx
+++ b/mobile/src/features/rescue/__tests__/screens.test.tsx
@@ -73,7 +73,7 @@ describe('Rescue screens', () => {
     expect(screen.root.findByProps({ children: 'Check Greek yogurt before Rescue can use it.' })).toBeTruthy();
     expect(screen.root.findAllByProps({ children: 'Chicken fillets' })).toHaveLength(0);
 
-    act(() => screen.root.findByProps({ accessibilityLabel: 'Check condition for Greek yogurt' }).props.onPress());
+    act(() => screen.root.findByProps({ accessibilityLabel: 'Open condition check Greek yogurt' }).props.onPress());
     expect(mockRouter.push).toHaveBeenCalledWith('/item/demo-04-best-before-past');
     act(() => screen.unmount());
   });
diff --git a/mobile/src/features/settings/SettingsScreen.tsx b/mobile/src/features/settings/SettingsScreen.tsx
index afcf7cc..442ff9e 100644
--- a/mobile/src/features/settings/SettingsScreen.tsx
+++ b/mobile/src/features/settings/SettingsScreen.tsx
@@ -1,8 +1,11 @@
 import { useRouter } from 'expo-router';
-import { useEffect, useState, type ComponentType } from 'react';
+import { useCallback, useEffect, useState, type ComponentType } from 'react';
+import { useTranslation } from 'react-i18next';
 
-import type { NotificationLeadDays } from '@/data/repositories';
 import { ResetDemoDataCard } from '@/features/onboarding';
+import { getFreshLoopDatabase } from '@/data/database/expo-sqlite';
+import { SettingsRepository } from '@/data/repositories/settings';
+import { changeLanguage, type SupportedLanguage, SUPPORTED_LANGUAGES } from '@/i18n';
 import { AppText, Button, Card, ErrorState, Screen, Skeleton } from '@/ui';
 
 import { openSettingsService, type ReminderSettings, type SettingsServiceApi } from './service';
@@ -12,6 +15,12 @@ const DeveloperDiagnostics: ComponentType<DeveloperDiagnosticsProps> | undefined
   ? require('./DeveloperDiagnostics').DeveloperDiagnostics
   : undefined;
 
+const LANGUAGE_LABELS: Readonly<Record<SupportedLanguage, string>> = {
+  en: 'English',
+  'zh-CN': '简体中文',
+  'zh-TW': '繁體中文',
+};
+
 type SettingsScreenProps = {
   readonly isDevelopment: boolean;
   readonly loadService?: () => Promise<SettingsServiceApi>;
@@ -27,22 +36,20 @@ async function requestSettings(loadService: () => Promise<SettingsServiceApi>):
   return { service, settings: await service.load() };
 }
 
-const LEAD_LABELS: Readonly<Record<NotificationLeadDays, string>> = {
-  3: '3 days before',
-  1: '1 day before',
-  0: 'On the relevant date',
-};
-
 export function SettingsScreenView({
   isDevelopment,
   loadService = openSettingsService,
 }: SettingsScreenProps) {
   const router = useRouter();
+  const { t, i18n } = useTranslation();
   const [service, setService] = useState<SettingsServiceApi>();
   const [settings, setSettings] = useState<ReminderSettings>();
   const [error, setError] = useState(false);
   const [busy, setBusy] = useState(false);
   const [message, setMessage] = useState<string>();
+  const [langBusy, setLangBusy] = useState(false);
+
+  const currentLang = (i18n.language as SupportedLanguage) ?? 'en';
 
   async function reload(): Promise<void> {
     setError(false);
@@ -80,7 +87,7 @@ export function SettingsScreenView({
       setSettings(await service.load());
     } catch (updateError) {
       if (!(updateError instanceof Error)) throw updateError;
-      setMessage('The setting could not be updated. Existing local data is unchanged.');
+      setMessage(t('settings.update_error'));
     } finally {
       setBusy(false);
     }
@@ -90,38 +97,52 @@ export function SettingsScreenView({
     await update(async (loaded) => {
       const result = await loaded.scheduleDiagnostic();
       setMessage(result === 'permission_denied'
-        ? 'Notification permission is denied. The app remains fully usable.'
-        : 'Diagnostic scheduled for 15 seconds from now.');
+        ? t('settings.diagnostic_permission_denied')
+        : t('settings.diagnostic_scheduled'));
     });
   }
 
+  const handleChangeLanguage = useCallback(async (language: SupportedLanguage) => {
+    setLangBusy(true);
+    try {
+      const db = await getFreshLoopDatabase();
+      const store = new SettingsRepository(db);
+      await changeLanguage(language, store);
+    } catch {
+      await changeLanguage(language);
+    } finally {
+      setLangBusy(false);
+    }
+  }, []);
+
   if (error) {
-    return <Screen eyebrow="Settings & About" title="Could not load settings"><ErrorState description="Local settings could not be read." onRetry={() => void reload()} retryLabel="Retry settings" title="Settings unavailable" /></Screen>;
+    return <Screen eyebrow={t('settings.eyebrow')} title={t('settings.title_error')}><ErrorState description={t('settings.error_description')} onRetry={() => void reload()} retryLabel={t('settings.error_retry')} title={t('settings.error_title')} /></Screen>;
   }
   if (settings === undefined) {
-    return <Screen eyebrow="Settings & About" title="FreshLoop"><Skeleton label="Loading settings" /></Screen>;
+    return <Screen eyebrow={t('settings.eyebrow')} title={t('settings.title')}><Skeleton label={t('settings.loading')} /></Screen>;
   }
 
   return (
-    <Screen eyebrow="Settings & About" testID="settings-screen" title="FreshLoop">
+    <Screen eyebrow={t('settings.eyebrow')} testID="settings-screen" title={t('settings.title')}>
       <Card>
-        <AppText role="sectionTitle">Pantry reminders</AppText>
-        <AppText>Optional local reminders use the relevant date from FreshLoop’s date assessment.</AppText>
+        <AppText role="sectionTitle">{t('settings.reminders_title')}</AppText>
+        <AppText>{t('settings.reminders_description')}</AppText>
         <Button
-          accessibilityLabel={settings.enabled ? 'Disable reminders' : 'Enable reminders'}
-          label={settings.enabled ? 'Disable reminders' : 'Enable reminders'}
+          accessibilityLabel={settings.enabled ? t('settings.disable') : t('settings.enable')}
+          label={settings.enabled ? t('settings.disable') : t('settings.enable')}
           loading={busy}
           onPress={() => void update((loaded) => loaded.setEnabled(!settings.enabled))}
           variant={settings.enabled ? 'secondary' : 'primary'}
         />
         {([3, 1, 0] as const).map((lead) => {
           const selected = settings.leads.includes(lead);
+          const leadKey = `settings.lead_${lead === 0 ? '0' : lead === 1 ? '1' : '3'}` as const;
           return (
             <Button
-              accessibilityLabel={`${LEAD_LABELS[lead]} reminder ${selected ? 'enabled' : 'disabled'}`}
+              accessibilityLabel={`${t(leadKey)} ${t('settings.reminders_title')} ${selected ? t('settings.on') : t('settings.off')}`}
               disabled={!settings.enabled || busy}
               key={lead}
-              label={`${LEAD_LABELS[lead]} · ${selected ? 'On' : 'Off'}`}
+              label={`${t(leadKey)} · ${selected ? t('settings.on') : t('settings.off')}`}
               onPress={() => void update((loaded) => loaded.setLeadEnabled(lead, !selected))}
               variant={selected ? 'secondary' : 'quiet'}
             />
@@ -129,6 +150,18 @@ export function SettingsScreenView({
         })}
         {message === undefined ? null : <AppText accessibilityLiveRegion="polite">{message}</AppText>}
       </Card>
+      <Card>
+        <AppText role="sectionTitle">{t('settings.language_title')}</AppText>
+        {SUPPORTED_LANGUAGES.map((lang) => (
+          <Button
+            disabled={langBusy}
+            key={lang}
+            label={LANGUAGE_LABELS[lang]}
+            onPress={() => void handleChangeLanguage(lang)}
+            variant={lang === currentLang ? 'primary' : 'quiet'}
+          />
+        ))}
+      </Card>
       {isDevelopment && DeveloperDiagnostics !== undefined ? (
         <DeveloperDiagnostics
           busy={busy}
@@ -138,10 +171,10 @@ export function SettingsScreenView({
       ) : null}
       <ResetDemoDataCard />
       <Card>
-        <AppText role="sectionTitle">About this app</AppText>
-        <AppText>FreshLoop is a local-first pantry companion. It records observed outcomes and never claims that a date guarantees food safety.</AppText>
-        <AppText>Open Food Facts data is available under ODbL 1.0.</AppText>
-        <AppText role="meta">Your pantry data stays on this device.</AppText>
+        <AppText role="sectionTitle">{t('settings.about_title')}</AppText>
+        <AppText>{t('settings.about_line1')}</AppText>
+        <AppText>{t('settings.about_line2')}</AppText>
+        <AppText role="meta">{t('settings.about_meta')}</AppText>
       </Card>
     </Screen>
   );
diff --git a/mobile/src/features/settings/__tests__/screen.test.tsx b/mobile/src/features/settings/__tests__/screen.test.tsx
index 737a81d..c3a6f6d 100644
--- a/mobile/src/features/settings/__tests__/screen.test.tsx
+++ b/mobile/src/features/settings/__tests__/screen.test.tsx
@@ -7,6 +7,21 @@ const mockRouter = { replace: jest.fn(), push: jest.fn() };
 
 jest.mock('expo-router', () => ({ useRouter: () => mockRouter }));
 
+jest.mock('react-i18next', () => {
+  let i18n: { t: (key: string, opts?: Record<string, unknown>) => string } | undefined;
+  return {
+    useTranslation: () => {
+      if (i18n === undefined) {
+        i18n = jest.requireActual('i18next');
+      }
+      return {
+        t: (key: string, opts?: Record<string, unknown>) => i18n!.t(key, opts ?? {}),
+        i18n: { language: 'en', changeLanguage: jest.fn() },
+      };
+    },
+  };
+});
+
 function fakeService(enabled = false): SettingsServiceApi {
   return {
     load: async () => ({ enabled, leads: [3, 1, 0] }),
diff --git a/mobile/src/features/today/TodayItemCard.tsx b/mobile/src/features/today/TodayItemCard.tsx
index 852131c..ed6baa0 100644
--- a/mobile/src/features/today/TodayItemCard.tsx
+++ b/mobile/src/features/today/TodayItemCard.tsx
@@ -1,10 +1,27 @@
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, View } from 'react-native';
 
 import type { RankedTodayItem } from '@/domain/priority/today-priority';
+import type { SafetyCopyKey } from '@/domain/dates/assessment';
 import { spacing } from '@/theme';
 import { AppText, Badge, Button, Card } from '@/ui';
 
-import { TODAY_REASON_COPY } from './model';
+const REASON_KEY_MAP: Readonly<Record<SafetyCopyKey, string>> = {
+  use_by_future: 'dates.use_by_future',
+  use_by_today: 'dates.use_by_today',
+  use_by_passed: 'dates.use_by_passed',
+  best_before_future_quality: 'dates.best_before_future_quality',
+  best_before_today_quality: 'dates.best_before_today_quality',
+  best_before_passed_check: 'dates.best_before_passed_check',
+  best_before_passed_confirmed: 'dates.best_before_passed_confirmed',
+  opened_life_future: 'dates.opened_life_future',
+  opened_life_last_day: 'dates.opened_life_last_day',
+  opened_life_passed: 'dates.opened_life_passed',
+  user_estimate_future: 'dates.user_estimate_future',
+  user_estimate_today: 'dates.user_estimate_today',
+  user_estimate_passed: 'dates.user_estimate_passed',
+  unknown_date: 'dates.unknown_date',
+};
 
 type TodayItemCardProps = {
   readonly entry: RankedTodayItem;
@@ -12,29 +29,39 @@ type TodayItemCardProps = {
   readonly onRescue?: () => void;
 };
 
-function badgeFor(entry: RankedTodayItem): {
-  readonly label: string;
-  readonly variant: 'unknown' | 'later' | 'use-soon' | 'use-first';
-} {
+export function TodayItemCard({ entry, onOpen, onRescue }: TodayItemCardProps) {
+  const { t } = useTranslation();
+
+  let badgeLabel: string;
+  let badgeVariant: 'unknown' | 'later' | 'use-soon' | 'use-first';
   if (entry.assessment.rescueEligibility === 'condition_required') {
-    return { label: 'Check condition', variant: 'use-soon' };
+    badgeLabel = t('today.badge_check_condition');
+    badgeVariant = 'use-soon';
+  } else {
+    switch (entry.tier) {
+      case 'blocked':
+        badgeLabel = t('today.badge_check_remove');
+        badgeVariant = 'use-first';
+        break;
+      case 'critical':
+        badgeLabel = t('today.badge_use_first');
+        badgeVariant = 'use-soon';
+        break;
+      case 'urgent':
+        badgeLabel = t('today.badge_use_soon');
+        badgeVariant = 'use-soon';
+        break;
+      case 'soon':
+        badgeLabel = t('today.badge_coming_up');
+        badgeVariant = 'later';
+        break;
+      case 'watch':
+        badgeLabel = t('today.badge_no_urgency');
+        badgeVariant = 'unknown';
+        break;
+    }
   }
-  switch (entry.tier) {
-    case 'blocked':
-      return { label: 'Check / remove', variant: 'use-first' };
-    case 'critical':
-      return { label: 'Use first', variant: 'use-soon' };
-    case 'urgent':
-      return { label: 'Use soon', variant: 'use-soon' };
-    case 'soon':
-      return { label: 'Coming up', variant: 'later' };
-    case 'watch':
-      return { label: 'No urgency assumed', variant: 'unknown' };
-  }
-}
 
-export function TodayItemCard({ entry, onOpen, onRescue }: TodayItemCardProps) {
-  const badge = badgeFor(entry);
   return (
     <Card testID={`today-${entry.tier}-${entry.item.id.value}`}>
       <View style={styles.header}>
@@ -44,12 +71,12 @@ export function TodayItemCard({ entry, onOpen, onRescue }: TodayItemCardProps) {
             {entry.item.quantity} {entry.item.unit} · {entry.item.storageLocation}
           </AppText>
         </View>
-        <Badge label={badge.label} variant={badge.variant} />
+        <Badge label={badgeLabel} variant={badgeVariant} />
       </View>
-      <AppText>{TODAY_REASON_COPY[entry.reasonCode]}</AppText>
-      <Button label={`View ${entry.item.name}`} onPress={onOpen} testID={`today-view-${entry.item.id.value}`} variant="secondary" />
+      <AppText>{t(REASON_KEY_MAP[entry.reasonCode])}</AppText>
+      <Button label={t('today.view_item', { name: entry.item.name })} onPress={onOpen} testID={`today-view-${entry.item.id.value}`} variant="secondary" />
       {onRescue === undefined ? null : (
-        <Button label={`Rescue ${entry.item.name}`} onPress={onRescue} testID={`today-rescue-${entry.item.id.value}`} variant="quiet" />
+        <Button label={t('today.rescue_item', { name: entry.item.name })} onPress={onRescue} testID={`today-rescue-${entry.item.id.value}`} variant="quiet" />
       )}
     </Card>
   );
diff --git a/mobile/src/features/today/TodayScreen.tsx b/mobile/src/features/today/TodayScreen.tsx
index d622503..b1a8f48 100644
--- a/mobile/src/features/today/TodayScreen.tsx
+++ b/mobile/src/features/today/TodayScreen.tsx
@@ -1,5 +1,6 @@
 import { useFocusEffect, useRouter } from 'expo-router';
 import { useCallback, useState } from 'react';
+import { useTranslation } from 'react-i18next';
 import { StyleSheet, View } from 'react-native';
 
 import { todayInHongKong } from '@/domain/dates/hong-kong-today';
@@ -67,6 +68,7 @@ export function TodayScreen({
   currentTime = currentDate,
 }: TodayScreenProps) {
   const router = useRouter();
+  const { t } = useTranslation();
   const [state, setState] = useState<TodayState>({ stage: 'loading' });
 
   const load = useCallback(async () => {
@@ -93,19 +95,19 @@ export function TodayScreen({
 
   if (state.stage === 'loading') {
     return (
-      <Screen eyebrow="Today · 今日" title="Loading today's priorities">
-        <Skeleton label="Loading Today" />
+      <Screen eyebrow={t('today.eyebrow_loading')} title={t('today.title_loading')}>
+        <Skeleton label={t('today.title_loading')} />
       </Screen>
     );
   }
   if (state.stage === 'error') {
     return (
-      <Screen eyebrow="Today · 今日" title="Today is unavailable">
+      <Screen eyebrow={t('today.eyebrow_loading')} title={t('today.title_error')}>
         <ErrorState
-          description="Local pantry data could not be read. Nothing was changed."
+          description={t('today.error_description')}
           onRetry={() => void load()}
-          retryLabel="Retry Today"
-          title="Could not load Today"
+          retryLabel={t('today.error_retry')}
+          title={t('today.error_title')}
         />
       </Screen>
     );
@@ -113,38 +115,40 @@ export function TodayScreen({
 
   const { dashboard, date } = state;
   const hasItems = dashboard.checkRequired.length + dashboard.actionable.length > 0;
+  const greeting = greetingForHour(Number(new Intl.DateTimeFormat('en-GB', { timeZone: 'Asia/Hong_Kong', hour: '2-digit', hourCycle: 'h23' }).format(date)));
+  const greetingKey = greeting === 'Good morning' ? 'today.greeting_morning' : greeting === 'Good afternoon' ? 'today.greeting_afternoon' : 'today.greeting_evening';
   return (
     <Screen
-      eyebrow={`${formatHongKongDay(date)} · Today`}
+      eyebrow={t('today.eyebrow', { day: formatHongKongDay(date) })}
       testID="today-screen"
-      title={`${greetingForHour(Number(new Intl.DateTimeFormat('en-GB', { timeZone: 'Asia/Hong_Kong', hour: '2-digit', hourCycle: 'h23' }).format(date)))}. What should I check first?`}>
-      <Button label="Add item" onPress={() => router.push('/item/add')} testID="today-add-item" />
+      title={t('today.title_ready', { greeting: t(greetingKey) })}>
+      <Button label={t('today.add_item')} onPress={() => router.push('/item/add')} testID="today-add-item" />
       {!hasItems ? (
         <EmptyState
-          actionLabel="Add your first item"
-          description="Add a local pantry item to receive explainable date guidance."
+          actionLabel={t('today.empty_action')}
+          description={t('today.empty_description')}
           onAction={() => router.push('/item/add')}
-          title="Nothing to rank yet"
+          title={t('today.empty_title')}
         />
       ) : null}
       {hasItems && !dashboard.hasDatedItems ? (
         <Card>
-          <AppText role="sectionTitle">No dated items</AppText>
-          <AppText>No urgency is assumed. Check labels and condition when you use these items.</AppText>
+          <AppText role="sectionTitle">{t('today.no_dated_title')}</AppText>
+          <AppText>{t('today.no_dated_description')}</AppText>
         </Card>
       ) : null}
       <Section
-        description="These items are kept out of Rescue. Open the item to check, confirm, use, discard, or remove it."
+        description={t('today.check_section_description')}
         entries={dashboard.checkRequired}
         onOpen={open}
-        title="Check or remove"
+        title={t('today.check_section_title')}
       />
       <Section
-        description="Ordered by the relevant date and explicit assessment reason."
+        description={t('today.use_section_description')}
         entries={dashboard.actionable}
         onOpen={open}
         onRescue={() => router.push('/rescue')}
-        title="Use next"
+        title={t('today.use_section_title')}
       />
     </Screen>
   );
diff --git a/mobile/src/i18n/index.ts b/mobile/src/i18n/index.ts
new file mode 100644
index 0000000..3b9e85f
--- /dev/null
+++ b/mobile/src/i18n/index.ts
@@ -0,0 +1,83 @@
+import i18next from 'i18next';
+import { initReactI18next } from 'react-i18next';
+import { getLocales } from 'expo-localization';
+
+import en from './locales/en.json';
+import zhCN from './locales/zh-CN.json';
+import zhTW from './locales/zh-TW.json';
+
+export type SupportedLanguage = 'en' | 'zh-CN' | 'zh-TW';
+
+export const SUPPORTED_LANGUAGES: readonly SupportedLanguage[] = ['en', 'zh-CN', 'zh-TW'];
+
+export const LANGUAGE_KEY = 'app.language';
+
+const resources = {
+  en: { translation: en },
+  'zh-CN': { translation: zhCN },
+  'zh-TW': { translation: zhTW },
+} as const;
+
+export function deviceLanguage(): SupportedLanguage {
+  const locales = getLocales();
+  if (locales.length === 0) return 'en';
+  const tag = locales[0]?.languageTag ?? 'en';
+  if (tag.startsWith('zh-Hans') || tag.startsWith('zh-CN')) return 'zh-CN';
+  if (tag.startsWith('zh-Hant') || tag.startsWith('zh-TW') || tag.startsWith('zh-HK')) return 'zh-TW';
+  return 'en';
+}
+
+export function isSupportedLanguage(value: string): value is SupportedLanguage {
+  return (SUPPORTED_LANGUAGES as readonly string[]).includes(value);
+}
+
+export type LanguageReader = {
+  get(key: string): Promise<string | null>;
+};
+
+export type LanguageWriter = {
+  set(key: string, value: string): Promise<void>;
+};
+
+export type LanguageStore = LanguageReader & LanguageWriter;
+
+export async function initI18n(store?: LanguageStore): Promise<SupportedLanguage> {
+  let language: SupportedLanguage = 'en';
+
+  if (store !== undefined) {
+    const stored = await store.get(LANGUAGE_KEY);
+    if (stored !== null && isSupportedLanguage(stored)) {
+      language = stored;
+    }
+  }
+
+  if (language === 'en') {
+    language = deviceLanguage();
+  }
+
+  // eslint-disable-next-line import/no-named-as-default-member
+  void i18next.use(initReactI18next).init({
+    compatibilityJSON: 'v4',
+    resources,
+    lng: language,
+    fallbackLng: 'en',
+    interpolation: { escapeValue: false },
+    returnNull: false,
+    returnEmptyString: false,
+  });
+
+  return language;
+}
+
+export async function changeLanguage(
+  language: SupportedLanguage,
+  store?: LanguageWriter,
+): Promise<void> {
+  // eslint-disable-next-line import/no-named-as-default-member
+  await i18next.changeLanguage(language);
+  if (store !== undefined) {
+    await store.set(LANGUAGE_KEY, language);
+  }
+}
+
+export default i18next;
diff --git a/mobile/src/i18n/locales/en.json b/mobile/src/i18n/locales/en.json
new file mode 100644
index 0000000..17b6c81
--- /dev/null
+++ b/mobile/src/i18n/locales/en.json
@@ -0,0 +1,242 @@
+{
+  "common": {
+    "all": "All",
+    "active": "Active",
+    "used": "Used",
+    "discarded": "Discarded",
+    "retry": "Try again",
+    "loading": "Loading"
+  },
+  "tabs": {
+    "today": "Today",
+    "pantry": "Pantry",
+    "rescue": "Rescue",
+    "insights": "Insights",
+    "settings": "Settings"
+  },
+  "today": {
+    "eyebrow_loading": "Today · 今日",
+    "eyebrow": "{{day}} · Today",
+    "title_loading": "Loading today's priorities",
+    "title_ready": "{{greeting}}. What should I check first?",
+    "title_error": "Today is unavailable",
+    "error_description": "Local pantry data could not be read. Nothing was changed.",
+    "error_retry": "Retry Today",
+    "error_title": "Could not load Today",
+    "add_item": "Add item",
+    "empty_action": "Add your first item",
+    "empty_description": "Add a local pantry item to receive explainable date guidance.",
+    "empty_title": "Nothing to rank yet",
+    "no_dated_title": "No dated items",
+    "no_dated_description": "No urgency is assumed. Check labels and condition when you use these items.",
+    "check_section_title": "Check or remove",
+    "check_section_description": "These items are kept out of Rescue. Open the item to check, confirm, use, discard, or remove it.",
+    "use_section_title": "Use next",
+    "use_section_description": "Ordered by the relevant date and explicit assessment reason.",
+    "greeting_morning": "Good morning",
+    "greeting_afternoon": "Good afternoon",
+    "greeting_evening": "Good evening",
+    "badge_check_condition": "Check condition",
+    "badge_check_remove": "Check / remove",
+    "badge_use_first": "Use first",
+    "badge_use_soon": "Use soon",
+    "badge_coming_up": "Coming up",
+    "badge_no_urgency": "No urgency assumed",
+    "view_item": "View {{name}}",
+    "rescue_item": "Rescue {{name}}"
+  },
+  "dates": {
+    "use_by_future": "Use By is approaching. Follow the pack instructions.",
+    "use_by_today": "Use By today. Follow the pack instructions.",
+    "use_by_passed": "Use By has passed. Check or remove this item; Rescue is unavailable.",
+    "best_before_future_quality": "Best Before is a quality date.",
+    "best_before_today_quality": "Best Before today refers to quality.",
+    "best_before_passed_check": "Best Before has passed. Check and confirm the condition today.",
+    "best_before_passed_confirmed": "Condition confirmed today after Best Before.",
+    "opened_life_future": "The stated opened-life window is active.",
+    "opened_life_last_day": "Last day of the stated opened-life window.",
+    "opened_life_passed": "The stated opened-life window has passed. Rescue is unavailable.",
+    "user_estimate_future": "Your estimated date is approaching.",
+    "user_estimate_today": "Your estimated date is today.",
+    "user_estimate_passed": "Your estimated date has passed. Check the item yourself.",
+    "unknown_date": "No date is recorded. Check the pack and condition without assuming urgency."
+  },
+  "pantry": {
+    "eyebrow": "Pantry · 儲藏室",
+    "title": "Everything you have",
+    "add_item": "Add item",
+    "search_accessibility": "Search pantry",
+    "search_helper": "Search English names or Traditional Chinese ingredient aliases.",
+    "search_label": "Search",
+    "filter_status": "Status",
+    "filter_category": "Category",
+    "filter_storage": "Storage",
+    "loading": "Loading pantry items",
+    "error_description": "Local pantry data could not be read. Nothing was changed.",
+    "error_retry": "Retry pantry",
+    "error_title": "Could not open Pantry",
+    "empty_action": "Add your first item",
+    "empty_description": "Manual entry works offline and remains available without scanning.",
+    "empty_title": "Your pantry is ready",
+    "no_match_action": "Clear filters",
+    "no_match_description": "No stored item matches the current search and filters.",
+    "no_match_title": "No matching items",
+    "open_item": "Open {{name}} details"
+  },
+  "rescue": {
+    "eyebrow": "Rescue · 拯救清單",
+    "title": "Cook from what needs attention",
+    "title_loading": "Finding local matches",
+    "title_error": "Rescue is unavailable",
+    "loading": "Ranking rescue recipes",
+    "error_description": "Local pantry data could not be ranked. Nothing was changed.",
+    "error_retry": "Retry Rescue",
+    "error_title": "Could not load Rescue",
+    "description": "Local recipes are ranked from date guidance, matched ingredients, missing ingredients, and cooking time.",
+    "safety_title": "Safety exclusions",
+    "safety_one": "{{count}} date-blocked item is excluded from every recipe.",
+    "safety_other": "{{count}} date-blocked items are excluded from every recipe.",
+    "condition_title": "Check condition first",
+    "condition_description": "Past Best Before is quality guidance. Confirm condition on the item page; the confirmation expires at Hong Kong midnight.",
+    "check_item": "Check {{name}} before Rescue can use it.",
+    "open_check": "Open condition check",
+    "empty_no_active_title": "No active ingredients yet",
+    "empty_no_active_action": "Add an item",
+    "empty_no_active_description": "Rescue only ranks active pantry items stored on this device.",
+    "empty_no_match_title": "No local recipe matches yet",
+    "empty_no_match_action": "Review Pantry",
+    "empty_no_match_description": "No recipe has an eligible pantry match with at most two missing non-staples. Check condition prompts or add ingredients.",
+    "ranked_title": "Ranked matches"
+  },
+  "insights": {
+    "eyebrow": "Insights · 數據洞察",
+    "title": "Observed pantry activity",
+    "title_loading": "Loading recorded activity",
+    "title_error": "Insights are unavailable",
+    "loading": "Loading Insights",
+    "error_description": "Recorded local activity could not be read. Nothing was changed.",
+    "error_retry": "Retry Insights",
+    "error_title": "Could not load Insights",
+    "description": "Recorded actions only. FreshLoop does not estimate waste prevented or convert outcomes into savings.",
+    "active_count": "Currently active",
+    "used_count": "Used recorded",
+    "discarded_count": "Discarded recorded",
+    "last_seven_days": "Last seven days",
+    "no_outcomes": "No outcomes recorded yet. The chart remains at zero until you record an action.",
+    "return_today": "Return to Today"
+  },
+  "settings": {
+    "eyebrow": "Settings & About",
+    "title": "FreshLoop",
+    "title_error": "Could not load settings",
+    "error_description": "Local settings could not be read.",
+    "error_retry": "Retry settings",
+    "error_title": "Settings unavailable",
+    "loading": "Loading settings",
+    "reminders_title": "Pantry reminders",
+    "reminders_description": "Optional local reminders use the relevant date from FreshLoop's date assessment.",
+    "enable": "Enable reminders",
+    "disable": "Disable reminders",
+    "lead_3": "3 days before",
+    "lead_1": "1 day before",
+    "lead_0": "On the relevant date",
+    "on": "On",
+    "off": "Off",
+    "update_error": "The setting could not be updated. Existing local data is unchanged.",
+    "diagnostic_permission_denied": "Notification permission is denied. The app remains fully usable.",
+    "diagnostic_scheduled": "Diagnostic scheduled for 15 seconds from now.",
+    "language_title": "Language",
+    "language_en": "English",
+    "language_zh_cn": "简体中文",
+    "language_zh_tw": "繁體中文",
+    "about_title": "About this app",
+    "about_line1": "FreshLoop is a local-first pantry companion. It records observed outcomes and never claims that a date guarantees food safety.",
+    "about_line2": "Open Food Facts data is available under ODbL 1.0.",
+    "about_meta": "Your pantry data stays on this device."
+  },
+  "onboarding": {
+    "eyebrow": "Private by default",
+    "title": "Welcome to FreshLoop",
+    "privacy_title": "Your pantry stays on this device",
+    "privacy_description": "No login, cloud account, or network connection is required for the core pantry.",
+    "dates_title": "Dates guide what to check",
+    "dates_description": "Use By and Best Before mean different things. FreshLoop explains the date basis but never declares food safe.",
+    "error_title": "FreshLoop could not finish setup",
+    "error_retry": "Try again",
+    "import_demo": "Import Demo Data",
+    "start_empty": "Start Empty"
+  },
+  "itemDetail": {
+    "eyebrow": "Item detail · 食材詳情",
+    "title_loading": "Loading item",
+    "loading": "Loading item details",
+    "title_missing": "Item not found",
+    "missing_description": "This item no longer exists in local storage.",
+    "missing_action": "Back to Pantry",
+    "error_title": "Missing item",
+    "edit": "Edit",
+    "delete": "Delete",
+    "confirm_use": "Mark Used",
+    "confirm_discard": "Mark Discarded",
+    "undo": "Undo",
+    "undo_time": "Undo available",
+    "status": "Status",
+    "quantity": "{{qty}} {{unit}}",
+    "date_basis": "Date basis",
+    "printed_date": "Printed date",
+    "opened_on": "Opened on",
+    "storage": "Storage",
+    "category": "Category",
+    "notes": "Notes",
+    "barcode": "Barcode",
+    "none": "None"
+  },
+  "addEdit": {
+    "add_title": "Add item",
+    "edit_title": "Edit item",
+    "name_label": "Name",
+    "name_error": "Enter an item name.",
+    "ingredient_label": "Ingredient",
+    "ingredient_error": "Choose a known ingredient or alias.",
+    "quantity_label": "Quantity",
+    "quantity_error": "Enter a positive number.",
+    "unit_label": "Unit",
+    "category_label": "Category",
+    "storage_label": "Storage",
+    "date_basis_label": "Date basis",
+    "printed_date_label": "Printed date",
+    "opened_on_label": "Opened on",
+    "opened_life_label": "Opened-life days",
+    "notes_label": "Notes",
+    "save": "Save",
+    "save_error": "Could not save item. Check the form and try again.",
+    "scan": "Scan barcode"
+  },
+  "scanner": {
+    "title": "Add item",
+    "scan_prompt": "Scan a barcode",
+    "offline": "Product lookup is unavailable offline. Enter the details manually below.",
+    "permission_denied": "Camera permission is needed to scan barcodes. Enter details manually.",
+    "manual": "Enter manually"
+  },
+  "recipe": {
+    "detail_title": "Recipe detail",
+    "matched": "Matched",
+    "missing": "Missing",
+    "staples": "Staples",
+    "steps": "Steps",
+    "cooking_time": "{{minutes}} minutes",
+    "difficulty": "Difficulty",
+    "disclaimer": "This recipe is a local suggestion. Check all ingredients for allergens and freshness before cooking."
+  },
+  "outcomes": {
+    "used": "Used",
+    "discarded": "Discarded",
+    "confirm_used": "Mark this item as used?",
+    "confirm_discarded": "Mark this item as discarded?",
+    "undo_success": "Outcome undone.",
+    "used_recorded": "Marked as used",
+    "discarded_recorded": "Marked as discarded",
+    "discard_reason": "Why discarded? (optional)"
+  }
+}
diff --git a/mobile/src/i18n/locales/zh-CN.json b/mobile/src/i18n/locales/zh-CN.json
new file mode 100644
index 0000000..bdaa65b
--- /dev/null
+++ b/mobile/src/i18n/locales/zh-CN.json
@@ -0,0 +1,242 @@
+{
+  "common": {
+    "all": "全部",
+    "active": "在用",
+    "used": "已用",
+    "discarded": "已弃",
+    "retry": "重试",
+    "loading": "加载中"
+  },
+  "tabs": {
+    "today": "今日",
+    "pantry": "储藏室",
+    "rescue": "拯救",
+    "insights": "洞察",
+    "settings": "设置"
+  },
+  "today": {
+    "eyebrow_loading": "今日 · Today",
+    "eyebrow": "{{day}} · 今日",
+    "title_loading": "正在加载今日优先级",
+    "title_ready": "{{greeting}}。先从哪开始？",
+    "title_error": "今日不可用",
+    "error_description": "无法读取本地储藏室数据，未做任何更改。",
+    "error_retry": "重试今日",
+    "error_title": "无法加载今日",
+    "add_item": "添加食材",
+    "empty_action": "添加第一个食材",
+    "empty_description": "添加本地储藏食材，获取可解释的日期指引。",
+    "empty_title": "暂无排序数据",
+    "no_dated_title": "无标注日期的食材",
+    "no_dated_description": "不假定任何紧迫性。使用前请检查标签和状态。",
+    "check_section_title": "检查或移除",
+    "check_section_description": "这些食材已排除在拯救之外。打开查看、确认、使用、丢弃或移除。",
+    "use_section_title": "优先使用",
+    "use_section_description": "按相关日期和明确的评估原因排序。",
+    "greeting_morning": "早上好",
+    "greeting_afternoon": "下午好",
+    "greeting_evening": "晚上好",
+    "badge_check_condition": "检查状态",
+    "badge_check_remove": "检查 / 移除",
+    "badge_use_first": "优先使用",
+    "badge_use_soon": "尽快使用",
+    "badge_coming_up": "临近",
+    "badge_no_urgency": "无紧迫性",
+    "view_item": "查看 {{name}}",
+    "rescue_item": "拯救 {{name}}"
+  },
+  "dates": {
+    "use_by_future": "保质期临近。请遵循包装说明。",
+    "use_by_today": "今日为保质期截止日。请遵循包装说明。",
+    "use_by_passed": "已过保质期。请检查或移除此食材，拯救功能不可用。",
+    "best_before_future_quality": "此日期为品质参考。",
+    "best_before_today_quality": "今日为最佳食用期，属品质参考。",
+    "best_before_passed_check": "已过最佳食用期。请今日检查并确认状态。",
+    "best_before_passed_confirmed": "已过最佳食用期后今日已确认状态。",
+    "opened_life_future": "开封后保质期内。",
+    "opened_life_last_day": "开封后保质期最后一天。",
+    "opened_life_passed": "已过开封后保质期。拯救功能不可用。",
+    "user_estimate_future": "您的预估日期临近。",
+    "user_estimate_today": "您的预估日期是今天。",
+    "user_estimate_passed": "您的预估日期已过。请自行检查。",
+    "unknown_date": "未记录日期。请自行检查包装和状态，不要假设紧迫性。"
+  },
+  "pantry": {
+    "eyebrow": "储藏室 · Pantry",
+    "title": "所有食材",
+    "add_item": "添加食材",
+    "search_accessibility": "搜索储藏室",
+    "search_helper": "可搜索英文名称或简体中文食材别名。",
+    "search_label": "搜索",
+    "filter_status": "状态",
+    "filter_category": "类别",
+    "filter_storage": "存放位置",
+    "loading": "加载储藏室食材",
+    "error_description": "无法读取本地储藏室数据，未做任何更改。",
+    "error_retry": "重试储藏室",
+    "error_title": "无法打开储藏室",
+    "empty_action": "添加第一个食材",
+    "empty_description": "手动录入支持离线使用，无需扫描即可添加。",
+    "empty_title": "储藏室已准备就绪",
+    "no_match_action": "清除筛选",
+    "no_match_description": "没有食材匹配当前搜索和筛选条件。",
+    "no_match_title": "无匹配食材",
+    "open_item": "打开 {{name}} 详情"
+  },
+  "rescue": {
+    "eyebrow": "拯救 · Rescue",
+    "title": "按需烹饪",
+    "title_loading": "正在寻找本地匹配",
+    "title_error": "拯救不可用",
+    "loading": "正在排序拯救食谱",
+    "error_description": "无法对本地储藏室数据排序，未做任何更改。",
+    "error_retry": "重试拯救",
+    "error_title": "无法加载拯救",
+    "description": "本地食谱按日期指引、匹配食材、缺少食材和烹饪时间进行排序。",
+    "safety_title": "安全排除",
+    "safety_one": "{{count}} 个日期受限食材已从所有食谱中排除。",
+    "safety_other": "{{count}} 个日期受限食材已从所有食谱中排除。",
+    "condition_title": "请先检查状态",
+    "condition_description": "已过最佳食用期仅为品质指引。请在食材页面确认状态；确认将在香港时间午夜失效。",
+    "check_item": "请先检查 {{name}}，之后拯救功能才可使用。",
+    "open_check": "打开状态检查",
+    "empty_no_active_title": "暂无可用食材",
+    "empty_no_active_action": "添加食材",
+    "empty_no_active_description": "拯救仅对存储在此设备上的在用食材进行排序。",
+    "empty_no_match_title": "暂无本地食谱匹配",
+    "empty_no_match_action": "查看储藏室",
+    "empty_no_match_description": "没有食谱满足最多缺少两种非主食的匹配条件。请检查状态提示或添加食材。",
+    "ranked_title": "排序匹配"
+  },
+  "insights": {
+    "eyebrow": "洞察 · Insights",
+    "title": "观察到的储藏活动",
+    "title_loading": "正在加载活动记录",
+    "title_error": "洞察不可用",
+    "loading": "加载洞察数据",
+    "error_description": "无法读取记录的活动数据，未做任何更改。",
+    "error_retry": "重试洞察",
+    "error_title": "无法加载洞察",
+    "description": "仅为记录的行为。FreshLoop 不估算减少的浪费或将结果转换为节省。",
+    "active_count": "当前在用",
+    "used_count": "已使用记录",
+    "discarded_count": "已丢弃记录",
+    "last_seven_days": "最近七天",
+    "no_outcomes": "暂无结果记录。图表会保持为零，直到您记录操作。",
+    "return_today": "返回今日"
+  },
+  "settings": {
+    "eyebrow": "设置与关于",
+    "title": "FreshLoop",
+    "title_error": "无法加载设置",
+    "error_description": "无法读取本地设置。",
+    "error_retry": "重试设置",
+    "error_title": "设置不可用",
+    "loading": "加载设置中",
+    "reminders_title": "储藏室提醒",
+    "reminders_description": "可选本地提醒使用 FreshLoop 日期评估中的相关日期。",
+    "enable": "启用提醒",
+    "disable": "禁用提醒",
+    "lead_3": "提前3天",
+    "lead_1": "提前1天",
+    "lead_0": "当天",
+    "on": "开",
+    "off": "关",
+    "update_error": "无法更新设置。现有本地数据未更改。",
+    "diagnostic_permission_denied": "通知权限已拒绝。应用仍可正常使用。",
+    "diagnostic_scheduled": "诊断通知已安排在15秒后。",
+    "language_title": "语言",
+    "language_en": "English",
+    "language_zh_cn": "简体中文",
+    "language_zh_tw": "繁體中文",
+    "about_title": "关于此应用",
+    "about_line1": "FreshLoop 是一款本地优先的储藏室助手。它记录观察到的结果，绝不声称日期能保证食品安全。",
+    "about_line2": "Open Food Facts 数据基于 ODbL 1.0 许可提供。",
+    "about_meta": "您的储藏室数据仅存储在此设备上。"
+  },
+  "onboarding": {
+    "eyebrow": "默认隐私保护",
+    "title": "欢迎使用 FreshLoop",
+    "privacy_title": "您的储藏室仅在此设备上",
+    "privacy_description": "无需登录、云账户或网络连接即可使用核心储藏室功能。",
+    "dates_title": "日期指引检查内容",
+    "dates_description": "保质期和最佳食用期含义不同。FreshLoop 解释日期依据，但绝不宣称食品安全。",
+    "error_title": "FreshLoop 无法完成设置",
+    "error_retry": "重试",
+    "import_demo": "导入演示数据",
+    "start_empty": "从零开始"
+  },
+  "itemDetail": {
+    "eyebrow": "食材详情 · Item detail",
+    "title_loading": "加载食材",
+    "loading": "加载食材详情",
+    "title_missing": "食材未找到",
+    "missing_description": "该食材已不在本地存储中。",
+    "missing_action": "返回储藏室",
+    "error_title": "缺少食材",
+    "edit": "编辑",
+    "delete": "删除",
+    "confirm_use": "标记已使用",
+    "confirm_discard": "标记已丢弃",
+    "undo": "撤销",
+    "undo_time": "可撤销",
+    "status": "状态",
+    "quantity": "{{qty}} {{unit}}",
+    "date_basis": "日期依据",
+    "printed_date": "包装日期",
+    "opened_on": "开封日期",
+    "storage": "存放位置",
+    "category": "类别",
+    "notes": "备注",
+    "barcode": "条码",
+    "none": "无"
+  },
+  "addEdit": {
+    "add_title": "添加食材",
+    "edit_title": "编辑食材",
+    "name_label": "名称",
+    "name_error": "请输入食材名称。",
+    "ingredient_label": "食材",
+    "ingredient_error": "请选择已知食材或别名。",
+    "quantity_label": "数量",
+    "quantity_error": "请输入正数。",
+    "unit_label": "单位",
+    "category_label": "类别",
+    "storage_label": "存放位置",
+    "date_basis_label": "日期依据",
+    "printed_date_label": "包装日期",
+    "opened_on_label": "开封日期",
+    "opened_life_label": "开封后保质天数",
+    "notes_label": "备注",
+    "save": "保存",
+    "save_error": "无法保存食材。请检查表单并重试。",
+    "scan": "扫描条码"
+  },
+  "scanner": {
+    "title": "添加食材",
+    "scan_prompt": "扫描条码",
+    "offline": "离线状态下无法查询产品信息。请在下方手动输入详情。",
+    "permission_denied": "扫描条码需要相机权限。请手动输入详情。",
+    "manual": "手动输入"
+  },
+  "recipe": {
+    "detail_title": "食谱详情",
+    "matched": "已有",
+    "missing": "缺少",
+    "staples": "主食",
+    "steps": "步骤",
+    "cooking_time": "{{minutes}} 分钟",
+    "difficulty": "难度",
+    "disclaimer": "此食谱为本地建议。请在使用前检查所有食材的过敏原和新鲜程度。"
+  },
+  "outcomes": {
+    "used": "已用",
+    "discarded": "已弃",
+    "confirm_used": "将此食材标记为已使用？",
+    "confirm_discarded": "将此食材标记为已丢弃？",
+    "undo_success": "结果已撤销。",
+    "used_recorded": "已标记为使用",
+    "discarded_recorded": "已标记为丢弃",
+    "discard_reason": "丢弃原因（选填）"
+  }
+}
diff --git a/mobile/src/i18n/locales/zh-TW.json b/mobile/src/i18n/locales/zh-TW.json
new file mode 100644
index 0000000..29a4cd4
--- /dev/null
+++ b/mobile/src/i18n/locales/zh-TW.json
@@ -0,0 +1,242 @@
+{
+  "common": {
+    "all": "全部",
+    "active": "在用",
+    "used": "已用",
+    "discarded": "已棄",
+    "retry": "重試",
+    "loading": "載入中"
+  },
+  "tabs": {
+    "today": "今日",
+    "pantry": "儲藏室",
+    "rescue": "拯救",
+    "insights": "洞察",
+    "settings": "設定"
+  },
+  "today": {
+    "eyebrow_loading": "今日 · Today",
+    "eyebrow": "{{day}} · 今日",
+    "title_loading": "正在載入今日優先級",
+    "title_ready": "{{greeting}}。先從哪開始？",
+    "title_error": "今日不可用",
+    "error_description": "無法讀取本地儲藏室數據，未做任何更改。",
+    "error_retry": "重試今日",
+    "error_title": "無法載入今日",
+    "add_item": "添加食材",
+    "empty_action": "添加第一個食材",
+    "empty_description": "添加本地儲藏食材，獲取可解釋的日期指引。",
+    "empty_title": "暫無排序數據",
+    "no_dated_title": "無標註日期的食材",
+    "no_dated_description": "不假定任何緊迫性。使用前請檢查標籤和狀態。",
+    "check_section_title": "檢查或移除",
+    "check_section_description": "這些食材已排除在拯救之外。開啟查看、確認、使用、丟棄或移除。",
+    "use_section_title": "優先使用",
+    "use_section_description": "按相關日期和明確的評估原因排序。",
+    "greeting_morning": "早晨",
+    "greeting_afternoon": "午安",
+    "greeting_evening": "晚安",
+    "badge_check_condition": "檢查狀態",
+    "badge_check_remove": "檢查 / 移除",
+    "badge_use_first": "優先使用",
+    "badge_use_soon": "盡快使用",
+    "badge_coming_up": "臨近",
+    "badge_no_urgency": "無緊迫性",
+    "view_item": "查看 {{name}}",
+    "rescue_item": "拯救 {{name}}"
+  },
+  "dates": {
+    "use_by_future": "保質期臨近。請遵循包裝說明。",
+    "use_by_today": "今日為保質期截止日。請遵循包裝說明。",
+    "use_by_passed": "已過保質期。請檢查或移除此食材，拯救功能不可用。",
+    "best_before_future_quality": "此日期為品質參考。",
+    "best_before_today_quality": "今日為最佳食用期，屬品質參考。",
+    "best_before_passed_check": "已過最佳食用期。請今日檢查並確認狀態。",
+    "best_before_passed_confirmed": "已過最佳食用期後今日已確認狀態。",
+    "opened_life_future": "開封後保質期內。",
+    "opened_life_last_day": "開封後保質期最後一天。",
+    "opened_life_passed": "已過開封後保質期。拯救功能不可用。",
+    "user_estimate_future": "您的預估日期臨近。",
+    "user_estimate_today": "您的預估日期是今天。",
+    "user_estimate_passed": "您的預估日期已過。請自行檢查。",
+    "unknown_date": "未記錄日期。請自行檢查包裝和狀態，不要假設緊迫性。"
+  },
+  "pantry": {
+    "eyebrow": "儲藏室 · Pantry",
+    "title": "所有食材",
+    "add_item": "添加食材",
+    "search_accessibility": "搜尋儲藏室",
+    "search_helper": "可搜尋英文名稱或繁體中文食材別名。",
+    "search_label": "搜尋",
+    "filter_status": "狀態",
+    "filter_category": "類別",
+    "filter_storage": "存放位置",
+    "loading": "載入儲藏室食材",
+    "error_description": "無法讀取本地儲藏室數據，未做任何更改。",
+    "error_retry": "重試儲藏室",
+    "error_title": "無法開啟儲藏室",
+    "empty_action": "添加第一個食材",
+    "empty_description": "手動錄入支援離線使用，無需掃描即可添加。",
+    "empty_title": "儲藏室已準備就緒",
+    "no_match_action": "清除篩選",
+    "no_match_description": "沒有食材匹配目前搜尋和篩選條件。",
+    "no_match_title": "無匹配食材",
+    "open_item": "開啟 {{name}} 詳情"
+  },
+  "rescue": {
+    "eyebrow": "拯救 · Rescue",
+    "title": "按需烹飪",
+    "title_loading": "正在尋找本地匹配",
+    "title_error": "拯救不可用",
+    "loading": "正在排序拯救食譜",
+    "error_description": "無法對本地儲藏室數據排序，未做任何更改。",
+    "error_retry": "重試拯救",
+    "error_title": "無法載入拯救",
+    "description": "本地食譜按日期指引、匹配食材、缺少食材和烹飪時間進行排序。",
+    "safety_title": "安全排除",
+    "safety_one": "{{count}} 個日期受限食材已從所有食譜中排除。",
+    "safety_other": "{{count}} 個日期受限食材已從所有食譜中排除。",
+    "condition_title": "請先檢查狀態",
+    "condition_description": "已過最佳食用期僅為品質指引。請在食材頁面確認狀態；確認將在香港時間午夜失效。",
+    "check_item": "請先檢查 {{name}}，之後拯救功能才可使用。",
+    "open_check": "開啟狀態檢查",
+    "empty_no_active_title": "暫無可用食材",
+    "empty_no_active_action": "添加食材",
+    "empty_no_active_description": "拯救僅對儲存在此裝置上的在用食材進行排序。",
+    "empty_no_match_title": "暫無本地食譜匹配",
+    "empty_no_match_action": "查看儲藏室",
+    "empty_no_match_description": "沒有食譜滿足最多缺少兩種非主食的匹配條件。請檢查狀態提示或添加食材。",
+    "ranked_title": "排序匹配"
+  },
+  "insights": {
+    "eyebrow": "洞察 · Insights",
+    "title": "觀察到的儲藏活動",
+    "title_loading": "正在載入活動記錄",
+    "title_error": "洞察不可用",
+    "loading": "載入洞察數據",
+    "error_description": "無法讀取記錄的活動數據，未做任何更改。",
+    "error_retry": "重試洞察",
+    "error_title": "無法載入洞察",
+    "description": "僅為記錄的行為。FreshLoop 不估算減少的浪費或將結果轉換為節省。",
+    "active_count": "目前在用",
+    "used_count": "已使用記錄",
+    "discarded_count": "已丟棄記錄",
+    "last_seven_days": "最近七天",
+    "no_outcomes": "暫無結果記錄。圖表會保持為零，直到您記錄操作。",
+    "return_today": "返回今日"
+  },
+  "settings": {
+    "eyebrow": "設定與關於",
+    "title": "FreshLoop",
+    "title_error": "無法載入設定",
+    "error_description": "無法讀取本地設定。",
+    "error_retry": "重試設定",
+    "error_title": "設定不可用",
+    "loading": "載入設定中",
+    "reminders_title": "儲藏室提醒",
+    "reminders_description": "可選本地提醒使用 FreshLoop 日期評估中的相關日期。",
+    "enable": "啟用提醒",
+    "disable": "禁用提醒",
+    "lead_3": "提前3天",
+    "lead_1": "提前1天",
+    "lead_0": "當天",
+    "on": "開",
+    "off": "關",
+    "update_error": "無法更新設定。現有本地數據未更改。",
+    "diagnostic_permission_denied": "通知權限已拒絕。應用仍可正常使用。",
+    "diagnostic_scheduled": "診斷通知已安排在15秒後。",
+    "language_title": "語言",
+    "language_en": "English",
+    "language_zh_cn": "简体中文",
+    "language_zh_tw": "繁體中文",
+    "about_title": "關於此應用",
+    "about_line1": "FreshLoop 是一款本地優先的儲藏室助手。它記錄觀察到的結果，絕不聲稱日期能保證食品安全。",
+    "about_line2": "Open Food Facts 數據基於 ODbL 1.0 許可提供。",
+    "about_meta": "您的儲藏室數據僅儲存在此裝置上。"
+  },
+  "onboarding": {
+    "eyebrow": "預設私隱保護",
+    "title": "歡迎使用 FreshLoop",
+    "privacy_title": "您的儲藏室僅在此裝置上",
+    "privacy_description": "無需登入、雲帳戶或網絡連接即可使用核心儲藏室功能。",
+    "dates_title": "日期指引檢查內容",
+    "dates_description": "保質期和最佳食用期含義不同。FreshLoop 解釋日期依據，但絕不宣稱食品安全。",
+    "error_title": "FreshLoop 無法完成設定",
+    "error_retry": "重試",
+    "import_demo": "匯入示範數據",
+    "start_empty": "從零開始"
+  },
+  "itemDetail": {
+    "eyebrow": "食材詳情 · Item detail",
+    "title_loading": "載入食材",
+    "loading": "載入食材詳情",
+    "title_missing": "食材未找到",
+    "missing_description": "該食材已不在本地儲存中。",
+    "missing_action": "返回儲藏室",
+    "error_title": "缺少食材",
+    "edit": "編輯",
+    "delete": "刪除",
+    "confirm_use": "標記已使用",
+    "confirm_discard": "標記已丟棄",
+    "undo": "撤銷",
+    "undo_time": "可撤銷",
+    "status": "狀態",
+    "quantity": "{{qty}} {{unit}}",
+    "date_basis": "日期依據",
+    "printed_date": "包裝日期",
+    "opened_on": "開封日期",
+    "storage": "存放位置",
+    "category": "類別",
+    "notes": "備註",
+    "barcode": "條碼",
+    "none": "無"
+  },
+  "addEdit": {
+    "add_title": "添加食材",
+    "edit_title": "編輯食材",
+    "name_label": "名稱",
+    "name_error": "請輸入食材名稱。",
+    "ingredient_label": "食材",
+    "ingredient_error": "請選擇已知食材或別名。",
+    "quantity_label": "數量",
+    "quantity_error": "請輸入正數。",
+    "unit_label": "單位",
+    "category_label": "類別",
+    "storage_label": "存放位置",
+    "date_basis_label": "日期依據",
+    "printed_date_label": "包裝日期",
+    "opened_on_label": "開封日期",
+    "opened_life_label": "開封後保質天數",
+    "notes_label": "備註",
+    "save": "儲存",
+    "save_error": "無法儲存食材。請檢查表單並重試。",
+    "scan": "掃描條碼"
+  },
+  "scanner": {
+    "title": "添加食材",
+    "scan_prompt": "掃描條碼",
+    "offline": "離線狀態下無法查詢產品資訊。請在下方手動輸入詳情。",
+    "permission_denied": "掃描條碼需要相機權限。請手動輸入詳情。",
+    "manual": "手動輸入"
+  },
+  "recipe": {
+    "detail_title": "食譜詳情",
+    "matched": "已有",
+    "missing": "缺少",
+    "staples": "主食",
+    "steps": "步驟",
+    "cooking_time": "{{minutes}} 分鐘",
+    "difficulty": "難度",
+    "disclaimer": "此食譜為本地建議。請在使用前檢查所有食材的過敏原和新鮮程度。"
+  },
+  "outcomes": {
+    "used": "已用",
+    "discarded": "已棄",
+    "confirm_used": "將此食材標記為已使用？",
+    "confirm_discarded": "將此食材標記為已丟棄？",
+    "undo_success": "結果已撤銷。",
+    "used_recorded": "已標記為使用",
+    "discarded_recorded": "已標記為丟棄",
+    "discard_reason": "丟棄原因（選填）"
+  }
+}