feat: Add i18n localization foundation (#461)#513
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Set up the translation message-catalog layer on top of the existing
language-preference infrastructure.
New files
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app/i18n/types.ts
Messages, MessageKey, InterpolationValues type definitions.
app/i18n/messages/en.ts
English base catalog (160+ keys across nav, auth, dashboard, events,
predictions, wallet, settings, disputes, finances, profile, errors,
feedback, and a11y namespaces).
app/i18n/messages/index.ts
Synchronous catalog loader with English fallback; exposes
getMessages(), AVAILABLE_LOCALES, and defaultMessages.
app/i18n/t.ts
interpolate() – {variable} placeholder substitution
createTranslator() – builds a t() function from a catalog
getTranslator() – server-safe helper (reads stored locale)
useTranslation() – React hook; reactive t() for client components
app/i18n/LangAttribute.tsx
Invisible client component; keeps <html lang> in sync with the
user's active locale on hydration and change.
app/i18n/__tests__/t.test.ts
31 tests covering interpolate, createTranslator, getTranslator,
getMessages, defaultMessages catalog integrity, and AVAILABLE_LOCALES.
Modified files
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app/i18n/index.ts
Extended with re-exports for all new types and utilities.
Existing Language/SUPPORTED_LANGUAGES/getStoredLanguage/saveLanguage
surface is unchanged – no breaking changes.
components/providers.tsx
Mounts <LangAttribute /> to keep document lang current.
app/settings/language/page.tsx
Demonstration integration: uses useTranslation() for all user-visible
strings (page heading, description, active label, helper note,
fieldset aria-label).
Test results
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New: 31 passed, 0 failed (app/i18n/__tests__/t.test.ts)
Existing: 539 passed (vs 508 before), 19 failed (vs 20 before)
Lint: ESLint binary not present in this environment (pre-existing)
Closes Predictify-org#461
feat: i18n foundation (Predictify-org#461)
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Closes #461