@@ -0,0 +1,10 @@
+---
+'@objectstack/service-datasource': patch
+---
+
+fix(service-datasource): the datasource driver catalog serves its words in the requester's language, so the New datasource dialog reads in one language
+
+Clause-②: no
+Metadata-protocol: none
+
+`GET /api/v1/datasources/drivers` now serves each driver's label and description, and each connection field's `title` and `description` (Filename, Auto-migrate schema, Host, Port, …), in the language the request names: the top `Accept-Language` tag, else `?locale=`. The code is read through the platform locale table (`platformLocaleTagOf`, shortened one subtag at a time), so `zh-TW` and `zh-HK` get Traditional Chinese, `zh`, `zh-CN` and `zh-SG` Simplified, `pt` Brazilian Portuguese and `fr-CA` French. Every language on the table is translated for every offered driver: Simplified and Traditional Chinese, Spanish, Arabic, French, Brazilian Portuguese, Russian, German, Japanese and Korean. English requests, codes the table does not name, and product names (SQLite, PostgreSQL, MySQL / MariaDB, MongoDB) are served the English text, never a key. `DRIVER_CATALOG` stays the English catalog, and the new `driverCatalogFor(locale)` in the package source builds the localized one; ids, icons, types and defaults are unchanged in every language.
@@ -122,6 +122,47 @@ describe('registerDatasourceAdminRoutes (real HonoHttpServer)', () => {
     expect(sqlite!.configSchema?.properties?.filename?.type).toBe('string');
   });
 
+  it('GET /api/v1/datasources/drivers serves the words in the requester\'s language', async () => {
+    const app = mount({});
+    type Served = { data: { drivers: Array<{ id: string; label: string; description?: string; configSchema: any }> } };
+    const read = async (init?: RequestInit, path = '/api/v1/datasources/drivers') => {
+      const res = await app.fetch(json(path, init));
+      expect(res.status).toBe(200);
+      const drivers = ((await res.json()) as Served).data.drivers;
+      return (id: string) => drivers.find((d) => d.id === id)!;
+    };
+
+    // The console sends its language as `Accept-Language` on every API call.
+    const zh = await read({ headers: { 'accept-language': 'zh-CN,zh;q=0.9,en;q=0.8' } });
+    expect(zh('sqlite').configSchema.properties.filename.title).toBe('文件名');
+    expect(zh('sqlite').configSchema.properties.autoMigrate.title).toBe('自动迁移表结构');
+    expect(zh('postgres').configSchema.properties.host.title).toBe('主机');
+    expect(zh('postgres').configSchema.properties.port.title).toBe('端口');
+    expect(zh('mysql').description).toBe('MySQL 或 MariaDB 连接。');
+    // A word the locale does not translate is the English one, not a key.
+    expect(zh('sqlite').label).toBe('SQLite');
+
+    // `?locale=` when no header names a language.
+    const query = await read(undefined, '/api/v1/datasources/drivers?locale=zh-CN');
+    expect(query('sqlite').configSchema.properties.filename.title).toBe('文件名');
+
+    // A Traditional Chinese reader gets Traditional, never the Simplified text.
+    const zhTW = await read({ headers: { 'accept-language': 'zh-TW,zh;q=0.9' } });
+    expect(zhTW('sqlite').configSchema.properties.filename.title).toBe('檔案名稱');
+    expect(zhTW('postgres').configSchema.properties.port.title).toBe('連接埠');
+
+    // Every other language on the platform table is served too.
+    const fr = await read({ headers: { 'accept-language': 'fr-FR,fr;q=0.9' } });
+    expect(fr('sqlite').configSchema.properties.filename.title).toBe('Nom de fichier');
+
+    // English, and a language the platform table does not name, are served the English words.
+    for (const lang of ['en-US', 'it-IT']) {
+      const en = await read({ headers: { 'accept-language': lang } });
+      expect(en('sqlite').configSchema.properties.filename.title, lang).toBe('Filename');
+      expect(en('postgres').configSchema.properties.host.title, lang).toBe('Host');
+    }
+  });
+
   it('GET /api/v1/datasources/:name/remote-tables lists remote tables', async () => {
     const listRemoteTables = vi.fn().mockResolvedValue([{ name: 'customers', columnCount: 4 }]);
     const app = mount({ listRemoteTables });
 
@@ -23,7 +23,10 @@ import {
   type BuiltinDriverId,
 } from '@objectstack/spec/data';
 
-import { DRIVER_CATALOG } from '../driver-catalog.js';
+import { PLATFORM_LOCALE_TAGS } from '@objectstack/spec/system';
+
+import { DRIVER_CATALOG, driverCatalogFor, driverCatalogLocaleOf } from '../driver-catalog.js';
+import { DRIVER_CATALOG_TRANSLATIONS } from '../driver-catalog-translations.js';
 
 describe('DRIVER_CATALOG', () => {
   it('serves the spec projection for every offered driver', () => {
@@ -82,3 +85,172 @@ describe('DRIVER_CATALOG', () => {
     }
   });
 });
+
+type JsonProp = { title?: string; description?: string; type?: string };
+const propsOf = (entry: { configSchema: Record<string, unknown> }) =>
+  (entry.configSchema as { properties: Record<string, JsonProp> }).properties;
+const entryOf = (catalog: typeof DRIVER_CATALOG, id: string) => {
+  const entry = catalog.find((d) => d.id === id);
+  if (!entry) throw new Error(`no ${id} entry`);
+  return entry;
+};
+const filenameTitle = (tag: string | undefined) => propsOf(entryOf(driverCatalogFor(tag), 'sqlite')).filename.title;
+
+/** The labels that are product names, served as written in every language. */
+const PRODUCT_NAME_LABELS = new Set(['sqlite', 'postgres', 'mysql', 'mongodb']);
+
+/**
+ * The catalog's words in the requester's language. The New datasource dialog
+ * draws exactly what the drivers route serves and has no key of its own for
+ * these words, so a Chinese console read `Filename`, `Auto-migrate schema`,
+ * `Host` and `Port` in English until the route served them translated.
+ */
+describe('driverCatalogFor', () => {
+  it('serves Simplified Chinese words for SQLite and the network drivers', () => {
+    const zh = driverCatalogFor('zh-CN');
+
+    const sqlite = entryOf(zh, 'sqlite');
+    expect(sqlite.description).toBe('基于文件（或内存）的 SQL 数据库，适合本地开发和小型部署。');
+    expect(propsOf(sqlite).filename.title).toBe('文件名');
+    expect(propsOf(sqlite).filename.description).toBe('数据库文件路径，或填 ":memory:" 使用临时内存数据库');
+    expect(propsOf(sqlite).autoMigrate.title).toBe('自动迁移表结构');
+
+    const postgres = entryOf(zh, 'postgres');
+    expect(propsOf(postgres).host).toMatchObject({ title: '主机', description: '主机地址' });
+    expect(propsOf(postgres).port).toMatchObject({ title: '端口', description: '端口号' });
+    expect(propsOf(postgres).password.title).toBe('密码');
+
+    expect(propsOf(entryOf(zh, 'mysql')).host.title).toBe('主机');
+    expect(propsOf(entryOf(zh, 'mongodb')).port.title).toBe('端口');
+    expect(entryOf(zh, 'memory').label).toBe('内存');
+  });
+
+  it('serves a word of its own in every language on the platform table', () => {
+    const expected: Record<string, string> = {
+      'zh-Hans': '文件名',
+      'zh-Hant': '檔案名稱',
+      es: 'Nombre de archivo',
+      ar: 'اسم الملف',
+      fr: 'Nom de fichier',
+      'pt-BR': 'Nome do arquivo',
+      ru: 'Имя файла',
+      de: 'Dateiname',
+      ja: 'ファイル名',
+      ko: '파일 이름',
+    };
+    expect(Object.keys(expected).sort()).toEqual(PLATFORM_LOCALE_TAGS.filter((t) => t !== 'en').sort());
+    for (const [tag, title] of Object.entries(expected)) expect(filenameTitle(tag), tag).toBe(title);
+  });
+
+  it('reads Traditional Chinese codes as Traditional, never Simplified', () => {
+    for (const tag of ['zh-TW', 'zh-HK', 'zh-MO', 'zh-Hant', 'zh-hant', 'zh-Hant-TW', 'zh-Hant-HK']) {
+      expect(driverCatalogLocaleOf(tag), tag).toBe('zh-Hant');
+      expect(filenameTitle(tag), tag).toBe('檔案名稱');
+    }
+    for (const tag of ['zh', 'zh-CN', 'zh-cn', 'zh-SG', 'zh-Hans', 'zh-Hans-CN']) {
+      expect(driverCatalogLocaleOf(tag), tag).toBe('zh-Hans');
+      expect(filenameTitle(tag), tag).toBe('文件名');
+    }
+  });
+
+  it('reads aliases and regional codes through the platform table', () => {
+    const cases: Array<[string, string]> = [
+      ['ja-JP', 'ja'], ['es-ES', 'es'], ['es-MX', 'es'], ['pt', 'pt-BR'], ['pt-PT', 'pt-BR'],
+      ['fr-CA', 'fr'], ['de-AT', 'de'], ['ko-KR', 'ko'], ['ar-EG', 'ar'], ['ru-RU', 'ru'],
+    ];
+    for (const [code, tag] of cases) expect(driverCatalogLocaleOf(code), code).toBe(tag);
+  });
+
+  it('keeps everything but the words: ids, icons, types and defaults are the English entry\'s', () => {
+    for (const tag of PLATFORM_LOCALE_TAGS) {
+      const served = driverCatalogFor(tag);
+      expect(served.map((d) => [d.id, d.icon]), tag).toEqual(DRIVER_CATALOG.map((d) => [d.id, d.icon]));
+      for (const entry of served) {
+        const english = propsOf(entryOf(DRIVER_CATALOG, entry.id));
+        const translated = propsOf(entry);
+        expect(Object.keys(translated), `${tag}.${entry.id}`).toEqual(Object.keys(english));
+        for (const key of Object.keys(english)) {
+          const { title: _t, description: _d, ...rest } = translated[key];
+          const { title: _et, description: _ed, ...englishRest } = english[key];
+          expect(rest, `${tag}.${entry.id}.${key}`).toEqual(englishRest);
+        }
+      }
+    }
+  });
+
+  it('serves English for no locale, English, or a code the platform table does not name', () => {
+    for (const tag of [undefined, '', 'en', 'en-US', 'en-GB', 'it', 'nl-NL', 'constructor', '__proto__']) {
+      expect(driverCatalogFor(tag), String(tag)).toBe(DRIVER_CATALOG);
+    }
+    expect(propsOf(entryOf(DRIVER_CATALOG, 'sqlite')).filename.title).toBe('Filename');
+    expect(propsOf(entryOf(DRIVER_CATALOG, 'postgres')).host.title).toBe('Host');
+  });
+
+  it('falls back to the English word where a language has none, never to a key', () => {
+    const zh = driverCatalogFor('zh-CN');
+    // Product names are not translated: the English label is served.
+    expect(entryOf(zh, 'sqlite').label).toBe('SQLite');
+    expect(entryOf(zh, 'postgres').label).toBe('PostgreSQL');
+    // The memory driver's fields carry a description and no title in English;
+    // the translation adds no title, so the form still names the field by key.
+    expect(propsOf(entryOf(zh, 'memory')).strictMode.title).toBeUndefined();
+    expect(propsOf(entryOf(zh, 'memory')).strictMode.description).toBe('记录不存在时抛出错误，而不是返回 null');
+  });
+
+  it('never writes the spec projection it overlays', () => {
+    for (const tag of PLATFORM_LOCALE_TAGS) driverCatalogFor(tag);
+    const sqlite = getDriverConfigJsonSchemaById('sqlite') as { properties: Record<string, JsonProp> };
+    expect(sqlite.properties.filename.title).toBe('Filename');
+    expect(propsOf(entryOf(DRIVER_CATALOG, 'sqlite')).filename.title).toBe('Filename');
+    expect(entryOf(DRIVER_CATALOG, 'memory').label).toBe('In-Memory');
+  });
+});
+
+/**
+ * Every language on the platform locale table against the served shape. It
+ * walks `PLATFORM_LOCALE_TAGS`, not the translation table's own keys, so a
+ * language the table lacks goes red here: the platform has one list of
+ * languages, each complete. A driver or field a language names must exist, so
+ * a renamed field cannot leave a translation that silently stops applying; and
+ * every word the English form shows must be translated, so a field the spec
+ * adds goes red here rather than reading English in a translated dialog.
+ */
+describe('DRIVER_CATALOG_TRANSLATIONS coverage', () => {
+  const offered = new Set(DRIVER_CATALOG.map((d) => d.id));
+  const languages = PLATFORM_LOCALE_TAGS.filter((tag) => tag !== 'en');
+
+  it('carries every non-English language on the platform table, and nothing else', () => {
+    expect(PLATFORM_LOCALE_TAGS).toContain('en');
+    expect(Object.keys(DRIVER_CATALOG_TRANSLATIONS).sort()).toEqual([...languages].sort());
+  });
+
+  for (const locale of languages) {
+    it(`${locale}: names only drivers and fields the catalog serves`, () => {
+      const table = DRIVER_CATALOG_TRANSLATIONS[locale];
+      expect(table, locale).toBeDefined();
+      for (const [id, text] of Object.entries(table ?? {})) {
+        expect(offered.has(id), `${locale}.${id}`).toBe(true);
+        const props = propsOf(entryOf(DRIVER_CATALOG, id));
+        for (const key of Object.keys(text?.fields ?? {})) {
+          expect(Object.prototype.hasOwnProperty.call(props, key), `${locale}.${id}.fields.${key}`).toBe(true);
+        }
+      }
+    });
+
+    it(`${locale}: translates every word the English form shows`, () => {
+      const table = DRIVER_CATALOG_TRANSLATIONS[locale];
+      for (const entry of DRIVER_CATALOG) {
+        const text = table?.[entry.id as keyof typeof table];
+        expect(text?.description, `${locale}.${entry.id}.description`).toBeTruthy();
+        if (!PRODUCT_NAME_LABELS.has(entry.id)) expect(text?.label, `${locale}.${entry.id}.label`).toBeTruthy();
+        for (const [key, prop] of Object.entries(propsOf(entry))) {
+          const field = text?.fields?.[key];
+          if (prop.title !== undefined) expect(field?.title, `${locale}.${entry.id}.${key}.title`).toBeTruthy();
+          if (prop.description !== undefined) {
+            expect(field?.description, `${locale}.${entry.id}.${key}.description`).toBeTruthy();
+          }
+        }
+      }
+    });
+  }
+});
@@ -35,6 +35,7 @@ import {
 } from '@objectstack/core';
 import type { TenancyPosture } from '@objectstack/spec/security';
 import type { ErrorCode } from '@objectstack/spec/api';
+import { preferredLocaleFromHeader } from '@objectstack/spec/system';
 // The slots this module resolves, by their declared contracts. Erasing a
 // lookup to `any` is banned (#4127/#4176/#4202/#4251) and the ban is right
 // here: `IAuthService` is what declares BOTH shapes of the session accessor
@@ -44,7 +45,7 @@ import type { ErrorCode } from '@objectstack/spec/api';
 import type { IAuthService, IDataEngine, IHttpServer } from '@objectstack/spec/contracts';
 // The declared envelope is written in ONE place for the whole platform (#3973).
 import { inProcessSessionReadInput, sendOk, sendError } from '@objectstack/types';
-import { DRIVER_CATALOG } from './driver-catalog.js';
+import { driverCatalogFor } from './driver-catalog.js';
 import { DRIVER_CATALOG_SEGMENT } from './datasource-route-reserved-names.js';
 // [#27618] The package's one "no such datasource" refusal: GET answers an
 // unknown name in its words, as every other by-name door does.
@@ -201,6 +202,19 @@ function toWebHeaders(raw: unknown): Headers | undefined {
   return undefined;
 }
 
+/**
+ * The requester's display language, read the way the REST metadata door and
+ * the settings routes read it: the top `Accept-Language` tag, else a string
+ * `?locale=`. The console sends its own language as `Accept-Language` on every
+ * API call. It picks the language of served words only and authorizes nothing.
+ */
+function requestLocaleOf(req: { headers?: unknown; query?: Record<string, unknown> } | undefined): string | undefined {
+  const preferred = preferredLocaleFromHeader(toWebHeaders(req?.headers)?.get('accept-language'));
+  if (preferred) return preferred;
+  const query = req?.query?.locale;
+  return typeof query === 'string' && query.length > 0 ? query : undefined;
+}
+
 /**
  * A `getSession(headers)` bound to the kernel's `auth` service, or `undefined`
  * when this deployment registers none.
@@ -705,9 +719,10 @@ export function registerDatasourceAdminRoutes(
   // Catalog of connection drivers + their JSON-Schema config (drives the
   // Studio connection form). Static metadata — no service dependency, so it
   // is always available even before any datasource-admin service is wired.
+  // Its words are served in the requester's language (`driverCatalogFor`).
   server.get(`${root}/${DRIVER_CATALOG_SEGMENT}`, async (req: any, res: any) => {
     if (await requireDatasourceAdmin(req, res)) return;
-    sendOk(res, { drivers: DRIVER_CATALOG });
+    sendOk(res, { drivers: driverCatalogFor(requestLocaleOf(req)) });
   });
 
   // Read-only schema introspection for the Studio "sync objects" flow.