How do you implement internationalization (i18n) in Remix?
Answer
Remix i18n implementation: URL-based routing: routes under routes/$lang/ prefix contain the locale. Use a root loader to detect locale from URL, cookie, or Accept-Language header. remix-i18next: the standard library. Setup: export async function loader({ request }) { const locale = await i18next.getLocale(request); return json({ locale }); }. Client side: const { locale } = useLoaderData(); useChangeLanguage(locale);. Translate in components: const { t } = useTranslation(); t("welcome.message"). Performance: load only the namespace needed per route: i18n.getFixedT(request, "checkout"). Namespaced translations reduce bundle size. SEO: export links with hreflang alternatives and meta with lang attribute. RTL support: set dir attribute on <html> based on locale. Date/number formatting: use Intl.DateTimeFormat and Intl.NumberFormat with the locale from the loader.
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