diff --git a/.changeset/25502-ai-reset-action-translation.md b/.changeset/25502-ai-reset-action-translation.md
new file mode 100644
index 00000000000..5f503ca41c1
--- /dev/null
+++ b/.changeset/25502-ai-reset-action-translation.md
@@ -0,0 +1,12 @@
+---
+'@objectstack/service-settings': patch
+---
+
+fix: Setup → AI's "Reset to environment defaults" button is now translated in zh-CN, ja-JP and es-ES
+
+Clause-②: no
+Metadata-protocol: none
+
+The `ai` settings manifest declares an `action_button` with id `reset`, but no locale bundle carried `settings.ai.actions.reset.label`, so the button rendered in English beside its translated siblings. The bundles now carry it (en, zh-CN, ja-JP, es-ES).
+
+The settings translation coverage test now reads every manifest's `action_button` labels: each shipped non-English locale must carry `settings.<namespace>.actions.<id>.label` for every action button, and no bundle may carry action copy for a button no manifest declares.
diff --git a/packages/services/service-settings/src/translations/en.ts b/packages/services/service-settings/src/translations/en.ts
index 6d425eedf93..08a00b069da 100644
--- a/packages/services/service-settings/src/translations/en.ts
+++ b/packages/services/service-settings/src/translations/en.ts
@@ -361,6 +361,7 @@ export const en: PlatformTranslationData = {
       actions: {
         test: { label: 'Test connection' },
         test_embedder: { label: 'Test embedder' },
+        reset: { label: 'Reset to environment defaults' },
       },
       banners: {
         log_prompts_warning: { title: 'Prompts may contain PII',
diff --git a/packages/services/service-settings/src/translations/es-ES.ts b/packages/services/service-settings/src/translations/es-ES.ts
index d226a1f83e7..eb08e6e4e8c 100644
--- a/packages/services/service-settings/src/translations/es-ES.ts
+++ b/packages/services/service-settings/src/translations/es-ES.ts
@@ -510,6 +510,7 @@ export const esES: PlatformTranslationData = {
       actions: {
         test: { label: 'Probar conexión' },
         test_embedder: { label: 'Probar embedder' },
+        reset: { label: 'Restablecer a los valores predeterminados del entorno' },
       },
       banners: {
         log_prompts_warning: { title: 'Los prompts pueden contener PII',
diff --git a/packages/services/service-settings/src/translations/ja-JP.ts b/packages/services/service-settings/src/translations/ja-JP.ts
index cd1b50017d3..e5ff34c9a9c 100644
--- a/packages/services/service-settings/src/translations/ja-JP.ts
+++ b/packages/services/service-settings/src/translations/ja-JP.ts
@@ -508,6 +508,7 @@ export const jaJP: PlatformTranslationData = {
       actions: {
         test: { label: '接続テスト' },
         test_embedder: { label: 'Embedder をテスト' },
+        reset: { label: '環境変数のデフォルトにリセット' },
       },
       banners: {
         log_prompts_warning: { title: 'PII 漏えいの可能性',
diff --git a/packages/services/service-settings/src/translations/settings-translation-coverage.test.ts b/packages/services/service-settings/src/translations/settings-translation-coverage.test.ts
index e44a94b39be..6a14ccbcd31 100644
--- a/packages/services/service-settings/src/translations/settings-translation-coverage.test.ts
+++ b/packages/services/service-settings/src/translations/settings-translation-coverage.test.ts
@@ -11,8 +11,10 @@
  *
  * This test pins each shipped non-English locale to full coverage of every
  * manifest's structural strings — namespace title/description, each group
- * title, each field label, and each `info_banner`'s title and text (keyed by
- * the banner's `id` under `settings.<namespace>.banners`). Dropdown *option* labels are intentionally
+ * title, each field label, each `info_banner`'s title and text (keyed by
+ * the banner's `id` under `settings.<namespace>.banners`), and each
+ * `action_button`'s label (keyed by the button's `id` under
+ * `settings.<namespace>.actions`). Dropdown *option* labels are intentionally
  * excluded: several must not be "translated" (the `timezone` option "UTC" is a
  * code; each `locale` option names its language in that language), and
  * option-level parity is filled per-locale on a best-effort basis.
@@ -56,6 +58,14 @@ function missingFor(data: { settings?: Record<string, any> }, m: SettingsManifes
       }
       if (tr?.banners?.[s.id]?.title == null) missing.push(`banner:${s.id}.title`);
       if (tr?.banners?.[s.id]?.text == null) missing.push(`banner:${s.id}.text`);
+    } else if (s.type === 'action_button') {
+      // Same as a banner: an action button is addressed by its `id`, and one
+      // without an id has no place in the bundle for its label.
+      if (!s.id) {
+        missing.push('action without an id');
+        continue;
+      }
+      if (tr?.actions?.[s.id]?.label == null) missing.push(`action:${s.id}`);
     } else if (s.key) {
       if (tr?.keys?.[s.key]?.label == null) missing.push(`key:${s.key}`);
     }
@@ -64,7 +74,7 @@ function missingFor(data: { settings?: Record<string, any> }, m: SettingsManifes
 }
 
 /**
- * The other direction: copy for a group, key or banner no manifest declares.
+ * The other direction: copy for a group, key, banner or action no manifest declares.
  * Such an entry renders nowhere, so it survives every review as dead text. The four
  * Localization format keys retired by #21958 are the case that named it.
  */
@@ -80,11 +90,14 @@ function undeclaredIn(data: { settings?: Record<string, any> }): string[] {
     const groups = new Set<string>();
     const keys = new Set<string>();
     const banners = new Set<string>();
+    const actions = new Set<string>();
     for (const s of m.specifiers) {
       if (s.type === 'group') {
         if (s.id) groups.add(s.id);
       } else if (s.type === 'info_banner') {
         if (s.id) banners.add(s.id);
+      } else if (s.type === 'action_button') {
+        if (s.id) actions.add(s.id);
       } else if (s.key) {
         keys.add(s.key);
       }
@@ -92,6 +105,7 @@ function undeclaredIn(data: { settings?: Record<string, any> }): string[] {
     for (const g of Object.keys(tr?.groups ?? {})) if (!groups.has(g)) extra.push(`${ns}.group:${g}`);
     for (const k of Object.keys(tr?.keys ?? {})) if (!keys.has(k)) extra.push(`${ns}.key:${k}`);
     for (const b of Object.keys(tr?.banners ?? {})) if (!banners.has(b)) extra.push(`${ns}.banner:${b}`);
+    for (const a of Object.keys(tr?.actions ?? {})) if (!actions.has(a)) extra.push(`${ns}.action:${a}`);
   }
   return extra;
 }
@@ -103,7 +117,7 @@ describe('settings translation coverage', () => {
 
   for (const [locale, data] of LOCALES) {
     for (const m of manifests) {
-      it(`${locale} covers settings.${m.namespace} (title / groups / keys / banners)`, () => {
+      it(`${locale} covers settings.${m.namespace} (title / groups / keys / banners / actions)`, () => {
         const missing = missingFor(data, m);
         expect(missing, `${locale} missing for ${m.namespace}: ${missing.join(', ')}`).toEqual([]);
       });
@@ -111,7 +125,7 @@ describe('settings translation coverage', () => {
   }
 
   for (const [locale, data] of [['en', en], ...LOCALES] as typeof LOCALES) {
-    it(`${locale} carries no copy for a group, key or banner no manifest declares`, () => {
+    it(`${locale} carries no copy for a group, key, banner or action no manifest declares`, () => {
       const extra = undeclaredIn(data);
       expect(extra, `${locale} has undeclared settings copy: ${extra.join(', ')}`).toEqual([]);
     });
diff --git a/packages/services/service-settings/src/translations/zh-CN.ts b/packages/services/service-settings/src/translations/zh-CN.ts
index 7bd43be08bb..47f36fc7868 100644
--- a/packages/services/service-settings/src/translations/zh-CN.ts
+++ b/packages/services/service-settings/src/translations/zh-CN.ts
@@ -547,6 +547,7 @@ export const zhCN: PlatformTranslationData = {
       actions: {
         test: { label: '测试连接' },
         test_embedder: { label: '测试 Embedder' },
+        reset: { label: '重置为环境变量默认值' },
       },
       banners: {
         log_prompts_warning: { title: 'Prompt 可能含有 PII', text: '可能泄露 PII,合规场景请关闭。' },