@@ -0,0 +1,17 @@
+---
+'@objectstack/spec': minor
+'@objectstack/cli': minor
+'@objectstack/lint': minor
+---
+
+feat(spec): a page `object-form`'s thank-you panel is translated through `pages.PAGE.components.ID.submitBehavior.title` / `.message`
+
+Clause-②: yes
+Metadata-protocol: added
+
+A page that embeds an `object-form` with `submitBehavior: { kind: 'thank-you', title, message }` used to confirm a create in the authoring language only: the strict `pages.PAGE.components.ID` translation entry declared no key for the panel, and `translatePage` never read `properties.submitBehavior`. A form view's own panel already had its key (`objects.OBJECT._views.VIEW.submitBehavior`); the page form, which takes the same member by reference, had none.
+
+- **The key.** `pages.PAGE.components.ID.submitBehavior` takes `title` and `message`, under the form component's own `id`, beside its `title` and `description`. It is the page's copy, so two pages binding the same object can word their panels differently. The node is the form view's panel node, built by one factory, so a `thankYou` key is refused naming `submitBehavior`, and `url` / `kind` are refused with a prescription. An `object-form` without an `id` has no key: give it one.
+- **The overlay.** `translatePage` overlays the two strings onto the component's `properties.submitBehavior` through the same function `translateView` uses for a form view's panel: only a `kind: 'thank-you'` panel is translated, only copy the form authors (a key cannot invent a `message`), and a missing key keeps the authored string. A form nested in a container is reached by the id route, as every other component copy is.
+- **Extraction and coverage.** `os i18n extract` scaffolds `pages.PAGE.components.ID.submitBehavior.title` / `.message` for every `object-form` the page addresses, and the coverage report counts an authored panel a supported locale leaves untranslated.
+- **Lint.** `os lint` refuses a `submitBehavior` key under a component that is not an `object-form`, and under a component id the page does not declare, offering the nearest form id.
@@ -72,6 +72,7 @@ export default defineStack({
 | Inline child-grid heading of a master-detail field (drawn on the parent's form) | `objects.<child>.fields.<field>.inlineTitle` — keyed on the child object that owns the field; untranslated it keeps its authored text, with no fallback to the child's plural label |
 | Picklist option labels | `objects.<name>.fields.<field>.options.<value>` |
 | View titles, descriptions, empty states | `objects.<name>._views.<view>` |
+| A form view's thank-you panel (shown after a submit) | `objects.<name>._views.<view>.submitBehavior.title` / `.message` — only when the form's `submitBehavior` is `kind: 'thank-you'`, and only copy the form authors: a key cannot add a `message` the form leaves to the default wording |
 | Bulk-action copy on a list view (button, confirm prompt, dialog fields) | `objects.<name>._views.<view>.bulkActions.<def>.label` / `.confirmText` / `.confirmLabel` / `.params.<param>.label` / `.help` / `.placeholder` — a bulk param's hint is `help`, not `helpText` |
 | Action labels, confirm text, success messages, disabled reasons | `objects.<name>._actions.<action>` |
 | Action result dialogs (title / description / acknowledge / field labels) | `objects.<name>._actions.<action>.resultDialog` |
@@ -87,6 +88,7 @@ export default defineStack({
 | Page labels and `page:header` copy | `pages.<name>.label` / `description` / `title` / `subtitle` — on a `kind: 'slotted'` page the header under `slots.header` is the page's header |
 | Page component copy, by component id | `pages.<name>.components.<id>.title` / `description` / `label` / `placeholder` / `emptyText` — reached under `regions[].components[]` and `slots.<slot>`, through `properties.children` and a `page:tabs` / `page:accordion` panel's `items[].children` |
 | Page tab labels (`page:tabs` items) | `pages.<name>.components.<tabsId>.items.<value>.label` — keyed by the tabs component's `id` and the item's `value`; an item without a `value` has no key (localize it with an inline locale map), and `page:accordion` panels have none |
+| A page `object-form`'s thank-you panel | `pages.<name>.components.<formId>.submitBehavior.title` / `.message` — keyed by the `object-form` component's `id` (a form without an `id` has no key), by the same rules as a form view's panel |
 | Screen-flow wizards (flow label, screen headings and body text, screen field copy) | `flows.<flow>.label` / `flows.<flow>.screens.<node_id>.title` / `.description` / `.fields.<field>.label` / `.placeholder` / `.inlineHelpText` — a screen field's help text is `inlineHelpText`, the key the field itself declares, not `help`; see the boundary note below |
 | Hook refusal messages | `hooks.<hook>.refusals.<CODE>.message` — one per entry of the hook's `refusals` catalogue. A sandboxed hook body refuses by code, and the server answers the refusal with this message in the caller's locale, else the declared `message` |
 | Position label / description | `positions.<name>.label` / `description` — keyed by the position's `name`; overlaid on every served position, which is the list the console's position picker draws |
 
@@ -1253,6 +1253,20 @@ export const ShowcaseTranslationBundle = {
           project_picker: { label: '项目', placeholder: '选择项目…' },
         },
       },
+      // `ui/pages/new-project-wizard.page.ts` — the create wizard's form, its
+      // heading and the thank-you panel it swaps in after the create.
+      showcase_new_project_wizard: {
+        components: {
+          new_project_form: {
+            title: '创建项目',
+            description: '三步向导：先填基本信息，再看健康状况，最后是预算与排期。',
+            submitBehavior: {
+              title: '项目已创建',
+              message: '新项目已就绪——可在「项目」中找到它，或重新打开此向导再创建一个。',
+            },
+          },
+        },
+      },
       // Nested per-component copy. These ids sit inside a container's
       // `properties.children`, which `translatePage` resolves (#12961) but
       // `os i18n extract` could not see until #13109 matched the extractor's
 
@@ -23,6 +23,10 @@ export const NewProjectWizardPage = definePage({
       name: 'main',
       components: [
         {
+          // The id is the form's translation address: its `title`,
+          // `description` and thank-you panel are keyed under
+          // `pages.showcase_new_project_wizard.components.new_project_form`.
+          id: 'new_project_form',
           type: 'object-form',
           properties: {
             objectName: 'showcase_project',
 
@@ -113,6 +113,8 @@
  *   pages.<page>.title / .subtitle   (from the page's `page:header` component)
  *   pages.<page>.components.<id>.<key>  (per-component copy, #6080)
  *   pages.<page>.components.<tabsId>.items.<value>.label  (a `page:tabs` item label)
+ *   pages.<page>.components.<formId>.submitBehavior.title / .message
+ *                                       (an `object-form`'s thank-you panel)
  *   flows.<flow>.label
  *   flows.<flow>.screens.<node_id>.title                       (#7646 / #11287)
  *   flows.<flow>.screens.<node_id>.description                 (#22507)
@@ -154,6 +156,7 @@ import {
   FLOW_SCREEN_FIELD_COPY_KEYS,
   FLOW_TERMINAL_MESSAGE_KEYS,
   PAGE_TABS_COMPONENT_TYPE,
+  PAGE_FORM_COMPONENT_TYPE,
   globalFilterKey,
   pageTabItemKey,
   walkAddressedPageComponents,
@@ -489,9 +492,29 @@ function pushFormViewCopy(out: ExpectedEntry[], objectName: string, key: string,
   const form = config && typeof config === 'object' ? config as { title?: unknown; submitBehavior?: any } : undefined;
   const root = ['objects', objectName, '_views', key];
   pushOptional(out, [...root, 'title'], form?.title, 'view', { objectName });
-  const thankYou = form?.submitBehavior?.kind === 'thank-you' ? form.submitBehavior : undefined;
-  pushOptional(out, [...root, 'submitBehavior', 'title'], thankYou?.title, 'view', { objectName });
-  pushOptional(out, [...root, 'submitBehavior', 'message'], thankYou?.message, 'view', { objectName });
+  pushThankYouPanel(out, root, form?.submitBehavior, 'view', { objectName });
+}
+
+/**
+ * Emit `<root>.submitBehavior.title` / `.message` for one form's
+ * `submitBehavior` — the panel's two slots, under whichever address its
+ * carrier has: a form view's `_views.<key>` ({@link pushFormViewCopy}) or a
+ * page `object-form` component's `pages.<page>.components.<id>`
+ * ({@link emitPageComponentCopy}). Only a `kind: 'thank-you'` panel authors
+ * copy; any other kind records both keys unauthored (`pushOptional`), so the
+ * two carriers cannot read the kind differently.
+ */
+function pushThankYouPanel(
+  out: ExpectedEntry[],
+  root: string[],
+  behavior: unknown,
+  source: ExpectedEntry['source'],
+  extra?: EntryScope,
+): void {
+  const panel = behavior && typeof behavior === 'object' ? behavior as { kind?: unknown; title?: unknown; message?: unknown } : undefined;
+  const thankYou = panel?.kind === 'thank-you' ? panel : undefined;
+  pushOptional(out, [...root, 'submitBehavior', 'title'], thankYou?.title, source, extra);
+  pushOptional(out, [...root, 'submitBehavior', 'message'], thankYou?.message, source, extra);
 }
 
 /**
@@ -1348,6 +1371,11 @@ function emitPageComponentCopy(out: ExpectedEntry[], page: any, name: string): v
           );
         }
       }
+      // An `object-form`'s thank-you panel, under the form component's id —
+      // the key `translatePage` reads, by the form view's panel's rules.
+      if (component.type === PAGE_FORM_COMPONENT_TYPE) {
+        pushThankYouPanel(out, ['pages', name, 'components', id as string], props.submitBehavior, 'page');
+      }
     }
     return component;
   });
 
@@ -0,0 +1,112 @@
+// Copyright (c) 2026 ObjectStack contributors. Apache-2.0 license.
+//
+// A page `object-form` component's thank-you panel (the `title` / `message`
+// of a `kind: 'thank-you'` `properties.submitBehavior`) is translated through
+// `pages.<page>.components.<id>.submitBehavior.{title,message}`
+// (`translatePage` overlays it, by the form view's panel's rules). The walker
+// emits both slots for every `object-form` the page addresses, so
+// `os i18n extract` scaffolds them and the coverage gate reports a locale
+// that leaves an authored panel untranslated.
+
+import { describe, it, expect } from 'vitest';
+import { collectExpectedEntries, extractTranslations } from '../src/utils/i18n-extract';
+import { computeI18nCoverage } from '../src/utils/i18n-coverage';
+import { TranslationDataSchema } from '@objectstack/spec/system';
+
+const panelKeys = (config: any) =>
+  collectExpectedEntries(config)
+    .map((e) => e.path.join('.'))
+    .filter((p) => p.startsWith('pages.') && p.includes('.submitBehavior.'));
+
+const form = (id: string | undefined, submitBehavior: unknown) => ({
+  ...(id ? { id } : {}),
+  type: 'object-form',
+  properties: { objectName: 'project', mode: 'create', submitBehavior },
+});
+
+const config = (translations: unknown[] = []) => ({
+  i18n: { defaultLocale: 'en', supportedLocales: ['en', 'zh-CN'] },
+  objects: [{ name: 'project', label: 'Project', fields: { name: { type: 'text', label: 'Name' } } }],
+  pages: [
+    {
+      name: 'project_wizard',
+      label: 'New Project',
+      type: 'app',
+      regions: [
+        {
+          name: 'main',
+          components: [
+            form('project_form', { kind: 'thank-you', title: 'Project created', message: 'Your project is ready.' }),
+            form('redirect_form', { kind: 'redirect', url: '/projects' }),
+            // No id: no address, so no slot.
+            form(undefined, { kind: 'thank-you', title: 'Anonymous' }),
+            // Not an `object-form`: no panel slot under its id.
+            { id: 'summary_card', type: 'page:card', properties: { title: 'Summary' } },
+            {
+              id: 'side_card',
+              type: 'page:card',
+              properties: { title: 'Quick add', children: [form('quick_form', { kind: 'thank-you', message: 'Added.' })] },
+            },
+          ],
+        },
+      ],
+    },
+  ],
+  translations,
+});
+
+describe("i18n walker — a page `object-form`'s thank-you panel, `components.<id>.submitBehavior`", () => {
+  it('emits both slots for each addressed `object-form`, nested ones included, and none elsewhere', () => {
+    expect(panelKeys(config()).sort()).toEqual([
+      'pages.project_wizard.components.project_form.submitBehavior.message',
+      'pages.project_wizard.components.project_form.submitBehavior.title',
+      'pages.project_wizard.components.quick_form.submitBehavior.message',
+      'pages.project_wizard.components.quick_form.submitBehavior.title',
+      'pages.project_wizard.components.redirect_form.submitBehavior.message',
+      'pages.project_wizard.components.redirect_form.submitBehavior.title',
+    ]);
+  });
+
+  it('seeds authored panel copy and leaves unauthored copy — and every non-thank-you kind — unseeded', () => {
+    const entries = collectExpectedEntries(config());
+    const at = (p: string) => entries.find((e) => e.path.join('.') === p);
+    const root = 'pages.project_wizard.components';
+    expect(at(`${root}.project_form.submitBehavior.title`)).toMatchObject({ sourceValue: 'Project created', inline: 'Project created' });
+    expect(at(`${root}.project_form.submitBehavior.message`)).toMatchObject({ sourceValue: 'Your project is ready.' });
+    expect(at(`${root}.quick_form.submitBehavior.title`)?.inline).toBeUndefined();
+    expect(at(`${root}.quick_form.submitBehavior.message`)).toMatchObject({ sourceValue: 'Added.' });
+    expect(at(`${root}.redirect_form.submitBehavior.title`)?.inline).toBeUndefined();
+    expect(at(`${root}.redirect_form.submitBehavior.message`)?.inline).toBeUndefined();
+  });
+
+  it('`os i18n extract` writes a skeleton the translation schema accepts', () => {
+    const page: any = extractTranslations(config(), { locales: ['en'] }).bundles.en?.pages?.project_wizard;
+    expect(page?.components?.project_form?.submitBehavior).toEqual({ title: 'Project created', message: 'Your project is ready.' });
+    const parsed = TranslationDataSchema.safeParse({ pages: { project_wizard: page } });
+    expect(parsed.success, JSON.stringify(parsed.error?.issues)).toBe(true);
+  });
+
+  it('the coverage gate reports authored panel copy a supported locale leaves untranslated', () => {
+    const issuesOf = (translations: unknown[]) => computeI18nCoverage(config(translations))
+      .issues.filter((i) => i.locale === 'zh-CN' && i.key.startsWith('pages.') && i.key.includes('.submitBehavior.'))
+      .map((i) => i.key)
+      .sort();
+    expect(issuesOf([{ 'zh-CN': { objects: { project: { label: '项目' } } } }])).toEqual([
+      'pages.project_wizard.components.project_form.submitBehavior.message',
+      'pages.project_wizard.components.project_form.submitBehavior.title',
+      'pages.project_wizard.components.quick_form.submitBehavior.message',
+    ]);
+    expect(issuesOf([{
+      'zh-CN': {
+        pages: {
+          project_wizard: {
+            components: {
+              project_form: { submitBehavior: { title: '项目已创建', message: '您的项目已就绪。' } },
+              quick_form: { submitBehavior: { message: '已添加。' } },
+            },
+          },
+        },
+      },
+    }])).toEqual([]);
+  });
+});
@@ -2490,6 +2490,80 @@ describe('validateTranslationReferences — `page:tabs` item labels (`components
   });
 });
 
+describe("validateTranslationReferences — an `object-form`'s thank-you panel (`components.<formId>.submitBehavior`)", () => {
+  /**
+   * The showcase wizard's shape: a page whose `object-form` authors a
+   * thank-you panel, beside a card that nests a second form, so each verdict
+   * below is judged against the same metadata as the clean run and differs
+   * only in the bundle.
+   */
+  const wizardStack = {
+    pages: [
+      {
+        name: 'project_wizard',
+        label: 'New Project',
+        regions: [{
+          name: 'main',
+          components: [
+            {
+              type: 'object-form',
+              id: 'project_form',
+              properties: { objectName: 'project', submitBehavior: { kind: 'thank-you', title: 'Project created' } },
+            },
+            {
+              type: 'page:card',
+              id: 'side_card',
+              properties: {
+                title: 'Quick add',
+                children: [{ type: 'object-form', id: 'quick_form', properties: { objectName: 'project' } }],
+              },
+            },
+          ],
+        }],
+      },
+    ],
+  };
+  const bundle = (components: unknown) =>
+    ({ ...wizardStack, translations: [{ 'zh-CN': { pages: { project_wizard: { components } } } }] });
+
+  it('reports nothing for a panel over a declared `object-form`, nested ones included', () => {
+    expect(validateTranslationReferences(bundle({
+      project_form: { title: '创建项目', submitBehavior: { title: '项目已创建' } },
+      quick_form: { submitBehavior: { message: '已添加。' } },
+    }))).toEqual([]);
+  });
+
+  it('refuses a panel on a component of another type, by name', () => {
+    const findings = validateTranslationReferences(bundle({ side_card: { submitBehavior: { title: 'x' } } }));
+    expect(findings).toHaveLength(1);
+    expect(findings[0].rule).toBe(TRANSLATION_TARGET_UNKNOWN);
+    expect(findings[0].severity).toBe('error');
+    expect(findings[0].path).toBe('translations[0]["zh-CN"].pages.project_wizard.components.side_card.submitBehavior');
+    expect(findings[0].message).toBe(
+      'Translations carry a thank-you panel for "side_card", which page "project_wizard" declares as a ' +
+        '`page:card`, not an `object-form`, so nothing resolves it.',
+    );
+    expect(findings[0].hint).toBe('Thank-you panel translations go under the `id` of an `object-form` component.');
+  });
+
+  it('refuses a panel under a component id the page does not declare, with the nearest form id offered', () => {
+    const findings = validateTranslationReferences(bundle({ project: { submitBehavior: { title: 'x' } } }));
+    expect(findings).toHaveLength(1);
+    expect(findings[0].path).toBe('translations[0]["zh-CN"].pages.project_wizard.components.project.submitBehavior');
+    expect(findings[0].message).toBe(
+      'Translations carry a thank-you panel for "project", a component id page "project_wizard" does not declare, ' +
+        'so nothing resolves it. Did you mean "project_form"?',
+    );
+  });
+
+  it('control: a page this stack does not declare is not judged by this check', () => {
+    expect(validateTranslationReferences({
+      ...wizardStack,
+      translations: [{ 'zh-CN': { pages: { other_page: { components: { f: { submitBehavior: { title: 'x' } } } } } } }],
+    })).toEqual([]);
+  });
+});
+
 describe('validateTranslationReferences — flow toasts and screen-field options (#22507)', () => {
   /**
    * hotclm's measured shape, trimmed: a screen flow that authors a completion