Guidelines for internationalizing a react-admin or shadcn admin kit application. Use when adding i18n support, creating translation files, translating hardcoded English strings in JSX, or reviewing i18n PRs in a react-admin project. Covers namespace conventions, interpolation, pluralization, locale-aware formatting, and the full workflow for converting an English-only app to multi-language. Trigger this skill whenever the user mentions i18n, internationalization, translation, localization, locale switching, or multi-language in a react-admin or shadcn admin kit context — even if they just say "translate this component" or "add French support".