/add-i18n

Implement multi-language support using next-intl. Set up locale detection from browser, URL, or user preference. Create translation files in JSON format for each locale (en, es, fr, etc.). Implement locale-based routing with Next.js App Router. Create language switcher component with dropdown or flags. Translate all UI text, error messages, and static content. Support RTL languages (Arabic, Hebrew) with directional CSS. Add number and date formatting per locale. Implement plural rules and interpolation. Provide translation workflow documentation for content team. Reference frontend-development-agent for Next.js integration. Test all languages for proper rendering.