feat: add multilingual fallback and locale detection#703
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AnnabelJoe merged 2 commits intoJul 3, 2026
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- middleware.ts: detect locale from Accept-Language header, persist as cookie, forward as x-locale header to server components; fallback to 'en' - lib/i18n.ts: message catalogue (en/es/fr/de/pt) + getTranslations() with English fallback for missing keys - layout.tsx: reads x-locale header, sets <html lang> dynamically - api/locale/route.ts: POST endpoint to switch locale via cookie
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Summary
Closes #535
Adds a zero-dependency i18n layer: locale is detected from the browser's
Accept-Languageheader, persisted in a cookie, and forwarded to server components via a custom header. A message catalogue covers 5 locales with English fallback for missing keys.Changes
src/middleware.tsAccept-Language, reads/writeslocalecookie, forwardsx-localeheadersrc/lib/i18n.tsgetTranslations(locale)helper with English fallbacksrc/app/layout.tsxx-localeheader, sets<html lang>dynamicallysrc/app/api/locale/route.tsPOST /api/locale— lets the client explicitly switch localeSupported locales
en(default),es,fr,de,ptDesign decisions
next-intl/i18nextbundle weight; can migrate laterlocaleoverrides header detection so user preference persists across sessionsgetTranslations()falls back to English per-key, not per-locale — so partial translations don't break the UIPOST /api/locale) is ready to wire up to a language picker component