feat(mobile): switch the settings language#33169

merged3

maria/lang-ru

maria/mobile-language

opened3d agobyMmaria

View on GitHubTwo-way sync enabledPR last imported 2h ago

Stacks on #31313.

The mobile app only ships in English. This adds a Language row to Settings (System default, English, Español, 中文（简体）, Português (Brasil), Français, Deutsch, 日本語, 한국어, Русский), built on gt-react-native. It translates the Settings list and the new Language page, switches live, and persists. It defaults to English. System default follows the device's languages, using the same matching as web (Traditional Chinese tags don't fall back to Simplified).

The setting is a language mobile preference with the same values as the web client setting, so packages/contracts is unchanged. Catalogs are committed JSON in apps/mobile/src/i18n/translations/, so forks and offline installs never hit GT's CDN. vp run i18n:generate refreshes the English source without credentials. Each locale was reviewed by a separate native-speaker copy-edit pass. No Metro or Babel config changed. gt-react-native's Babel plugin only injects Intl polyfills, so src/i18n/intl-polyfills.ts imports the two that GT's locale validation needs on Hermes (Intl.Locale, English Intl.DisplayNames). gt-react-native includes a small native module (device locale list), so this changes the native fingerprint and needs a new dev client or store build. OTA updates stay gated by the fingerprint runtime version.

Two GT behaviors needed handling. GT persists any locale passed to its provider and prefers that over the device, so System default reads the device list from gt-react-native's native module directly. GT also suspends to a full-screen spinner while a catalog loads; the locale goes through useDeferredValue, so the current language stays on screen until the new one is ready.

Settings in English with the new Language row showing English

Language page open with System default, English selected, and the eight other languages in their native names

Settings in Spanish: Ajustes, Conexiones, Idioma set to Español

Settings in Japanese: 設定, 言語 set to 日本語

Settings in Russian: Настройки, Язык set to Русский

Language page in Russian with Как в системе and Русский selected

System default with the app's Android language set to German: Einstellungen, Sprache shows Systemstandard

Verified on an Android 16 emulator with a fresh dev client: switching and persistence across relaunch, System default following a German per-app locale, and no spinner while switching. vp run check:changed passes. Unverified: iOS (no macOS host here), including the device-language read, which skips NSLocale.currentLocale because it reports the app's English bundle language; and the tablet sidebar layout. Out of scope: the overflow tab rows and the stack header titles still use English, as do the other settings pages.

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MmacroscopeappBotapproved these changes · review dismissed3d ago

MmacroscopeappBot3d ago

Approvability

Verdict: Approved at 41be33f

Macroscope's review found this PR approvable — Adds a mobile settings-language picker with bundled translations while retaining English as the default. The change is limited to presentation and a saved language preference, with no obvious material risk requiring human judgment.

No code changes detected at 6003e83. Prior analysis still applies.

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Ggithub-actionsBot3d ago

Thread transfer impact

✅ Thread transfer remains within every enforced ceiling.

ℹ️ No successful main baseline artifact is available yet. This run establishes the initial measurement.

Provider	Metric	Main baseline	This PR	Impact	PR ceiling
Codex	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Codex	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Codex	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Codex	Live turn WebSocket decoded	—	21.5 KiB	—	24.4 KiB	✅
Codex	Live turn messages	—	1	—	8	✅
Claude	Total thread wire	—	5.0 KiB	—	6.8 KiB	✅
Claude	Thread snapshot wire	—	3.8 KiB	—	4.9 KiB	✅
Claude	Live turn WebSocket wire	—	1.2 KiB	—	2.0 KiB	✅
Claude	Live turn WebSocket decoded	—	21.9 KiB	—	24.4 KiB	✅
Claude	Live turn messages	—	1	—	8	✅

Baseline: unavailable · PR result: 6003e83 · Source CI: success

Scenario and decoded snapshot size

10 historical turns, 5 command tools per turn, 878.9 KiB retained MCP result per historical turn, and a 1.05 MiB retained result in the measured turn.

Codex decoded thread snapshot: 108.5 KiB
Claude decoded thread snapshot: 108.8 KiB

Updated in place by a trusted workflow. PR artifacts are strictly validated and never executed.

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Walkthrough

The mobile app adds localization for settings in English and eight other locales. It resolves the active locale from a saved language preference or device locales. A new settings route lets users choose the system default or a supported locale. Locale-resolution utilities move to the shared client-runtime package and are used by the web app.

Changes: Localization and language settings

Layer / File(s)	Summary
Shared locale utilities `packages/client-runtime/src/locales.ts`, `packages/client-runtime/package.json`, `apps/web/src/i18n/*`, `apps/web/src/components/settings/SettingsPanels.tsx`	Adds shared locale-name and locale-resolution utilities. The web app imports these utilities in place of its local implementations.
Mobile locale runtime and preference `apps/mobile/gt.config.json`, `apps/mobile/package.json`, `apps/mobile/src/i18n/*`, `apps/mobile/src/persistence/mobile-preferences.ts`	Adds locale configuration, translation tooling and catalogs, polyfills, and locale resolution. Preferences now preserve a string language setting.
Translated settings and language selection `apps/mobile/src/Stack.tsx`, `apps/mobile/src/features/settings/*`	Localizes settings labels and search text, registers a language settings route, and adds a language row that displays the selected locale name or system default.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Change: Feature

Sequence Diagram(s)

mermaid

1	sequenceDiagram
2	actor User
3	participant SettingsLanguageRouteScreen
4	participant MobilePreferences
5	participant I18nProvider
6	participant resolveLocale
7	participant GTProvider
8	User->>SettingsLanguageRouteScreen: Select a language
9	SettingsLanguageRouteScreen->>MobilePreferences: Save language preference
10	I18nProvider->>MobilePreferences: Read saved language preference
11	I18nProvider->>resolveLocale: Resolve saved language and system locales
12	resolveLocale-->>I18nProvider: Return supported locale or default
13	I18nProvider->>GTProvider: Provide locale and translation catalog

Possibly related issues

pingdotgg/t3code#27396: The issue reports that opening Settings pages through links can hang the iOS app on a folded iPhone Duo. This change adds a Language settings page but does not address the reported navigation failure.

Suggested reviewers: juliusmarminge

Merge Risk: External image Low · previous review 307f3

The Language row is hard to find with an English "language" search when the app is in Japanese. This is a minor gap that can be fixed by adding a search term. Otherwise the change looks safe to merge.

Pre-merge checks: ^Passed 4

Check name	Status	Explanation
Title check	Passed	The title "feat(mobile): switch the settings language" matches the main change. The PR adds a Language settings row and page to the mobile app, with live switching and persistence. It follows the conv…
Description check	Passed	The description follows the template sections: Problem, Change, Scope and approval, and Verification. It explains the mobile language setting, the gt-react-native integration, committed translation ca…
Linked Issues check	Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	Passed	Check skipped because no linked issues were found for this pull request.

Full details: Title check

Explanation

The title "feat(mobile): switch the settings language" matches the main change. The PR adds a Language settings row and page to the mobile app, with live switching and persistence. It follows the conventional commit format from the template. The title is specific and short, so it passes.

Full details: Description check

Explanation

The description follows the template sections: Problem, Change, Scope and approval, and Verification. It explains the mobile language setting, the gt-react-native integration, committed translation catalogs, and the native fingerprint impact. It gives Android 16 emulator verification steps and results, and it names what is unverified (iOS, tablet layout). Screenshots are embedded for the UI change. The Problem section is only implied, not stated as a bug or missing feature, and the Scope and approval section does not link an issue or maintainer approval. It also says the change stacks on another PR. These gaps are non-critical for a PASS, but the author should state the problem explicitly and add the approval link or the focused-configuration rationale that the template asks for.

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`apps/mobile/src/features/settings/SettingsLanguageRouteScreen.tsx`
`apps/mobile/src/features/settings/SettingsRouteScreen.tsx`
`apps/mobile/src/i18n/I18nProvider.tsx`
`apps/mobile/src/i18n/locales.ts`
`apps/web/src/components/settings/SettingsPanels.tsx`
`apps/web/src/i18n/locales.ts`
`apps/web/src/i18n/runtime.ts`
`packages/client-runtime/package.json`
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apps/web/src/i18n/locales.ts

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`apps/mobile/gt.config.json`
`apps/mobile/package.json`
`apps/mobile/src/Stack.tsx`
`apps/mobile/src/features/settings/SettingsLanguageRouteScreen.tsx`
`apps/mobile/src/features/settings/SettingsRouteScreen.tsx`
`apps/mobile/src/features/settings/components/settings-page-targets.ts`
`apps/mobile/src/features/settings/settings-search.ts`
`apps/mobile/src/i18n/I18nProvider.tsx`
`apps/mobile/src/i18n/intl-polyfills.ts`
`apps/mobile/src/i18n/locales.ts`
`apps/mobile/src/i18n/translations/de.json`
`apps/mobile/src/i18n/translations/en.json`
`apps/mobile/src/i18n/translations/es.json`
`apps/mobile/src/i18n/translations/fr.json`
`apps/mobile/src/i18n/translations/ja.json`
`apps/mobile/src/i18n/translations/ko.json`
`apps/mobile/src/i18n/translations/pt-BR.json`
`apps/mobile/src/i18n/translations/ru.json`
`apps/mobile/src/i18n/translations/zh.json`
`apps/mobile/src/persistence/mobile-preferences.ts`

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Actionable comments posted: 1

Fix comments: Fix CodeRabbit comments on this PR

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7	Review comments at @apps/mobile/src/features/settings/SettingsRouteScreen.tsx:
8	- Line 274: Update the search terms for the SettingsLanguage row in the page
9	configuration to include “language,” while preserving its existing keywords so
10	users can find it by its English name regardless of the displayed locale.
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`apps/mobile/src/features/settings/SettingsRouteScreen.tsx`

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apps/mobile/src/features/settings/SettingsRouteScreen.tsxline 274Outdated · 57fb6d7Open thread

…	…	@@ -240,43 +269,52 @@ function useSettingsIndexSections(): SettingsListSection[] {
245		-	page("SettingsFollowUp", "bubble.left.and.bubble.right", "Chat"),
	272	+	page("SettingsOrganization", "gearshape", gt("General")),
	273	+	page("SettingsAppearance", "paintbrush", gt("Appearance")),
	274	+	page("SettingsLanguage", "globe", gt("Language"), {

CcoderabbitaiBoton line 2741d ago

External image Minor · Functional Correctness · Quick win

Keep the Language row searchable by its English name.

When the locale is Japanese, this row is labeled “言語”. Settings search checks that label and the keywords locale, translation, and english, so a search for “language” omits the row. Add language to the SettingsLanguage search terms so users can find the control when switching languages. (raw.githubusercontent.com)

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3	Review comment at @apps/mobile/src/features/settings/SettingsRouteScreen.tsx at line 274:
4	Update the search terms for the SettingsLanguage row in the page configuration to include “language,” while preserving its existing keywords so users can find it by its English name regardless of the displayed locale.
5
6	After applying the fix, consider running `coderabbit review --agent` for local review. Visit https://docs.coderabbit.ai/cli?utm_source=ghpr

✅ Confirmed as addressed by @maria-rcks

Mmaria3h ago

Note

Written by claude-fable-5-2 on behalf of Maria

Fixed in 41be33f059: language is now a search term for the Language row, so it is found by its English name in any UI language.

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MmacroscopeappBotreviewed · 1 inline thread3h ago

apps/mobile/src/i18n/I18nProvider.tsxline 51Outdated · 307f39aOpen thread

…	…	@@ -0,0 +1,76 @@
	48	+	)?.getNativeLocales() ?? [];
	49	+	// On iOS the first entry is NSLocale.currentLocale, whose language is the app's bundle
	50	+	// localization (English only), not the user's; preferredLanguages follow it.
	51	+	return Platform.OS === "ios" ? locales.slice(1) : locales;

MmacroscopeappBoton line 513h ago

🟠 High i18n/I18nProvider.tsx:51

When iOS’s current locale is also the first preferred language, this drops that preference from the system locale list: getNativeLocales() returning ["en-US", "es"] becomes ["es"], so system mode selects Spanish instead of English. Because getNativeLocales() deduplicates the current locale against preferred languages, slice(1) cannot reliably remove only the extra regional entry; retrieve the preferred languages without that deduplicated prefix or otherwise preserve the first preference.

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text

1	In file @apps/mobile/src/i18n/I18nProvider.tsx around line 51:
2
3	When iOS’s current locale is also the first preferred language, this drops that preference from the system locale list: `getNativeLocales()` returning `["en-US", "es"]` becomes `["es"]`, so system mode selects Spanish instead of English. Because `getNativeLocales()` deduplicates the current locale against preferred languages, `slice(1)` cannot reliably remove only the extra regional entry; retrieve the preferred languages without that deduplicated prefix or otherwise preserve the first preference.

Mmaria3h ago

Note

Written by claude-fable-5-2 on behalf of Maria

Not changing this. The dedupe the finding relies on does not happen on a device.

getNativeLocalesImpl in gt-react-native/ios/GtReactNative.mm puts [[NSLocale currentLocale] localeIdentifier] first, then appends each [NSLocale preferredLanguages] entry that is not an exact string match. localeIdentifier uses the underscore form (en_US), and preferred languages use BCP 47 hyphens (en-US). The two strings never match, so the list is ["en_US", "en-US", "es-ES"], and slice(1) leaves the user's full preferred list in order.

The ["en-US", "es"] case in the finding needs a current locale with no underscore, which only happens with a launch-argument override such as -AppleLocale en-US. iOS requires a region on a real device.

This is from reading the native source. It was not re-run on an iOS device for this reply.

Mmariareviewed3h ago

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Mmariareviewed3h ago

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MmacroscopeappBotapproved these changes3h ago

Added 3 commits2h ago

feat(mobile): switch the settings language2cfb415
fix(mobile): the Language row is found by its English name in any language6003e83
refactor: web and mobile share one locale matcher7d350cc