Also covers React 19 Suspense integration, the Trans component for JSX inside translations, RTL language support, fallback strategies for missing keys, and unit-testing i18n setups. This skill is explicitly for React apps without Next.js — for Next.js App Router i18n use nextjs-i18n, and for Astro use astro-i18n.

react-i18next for React 19

Agent Workflow (MANDATORY)

Before ANY implementation, use TeamCreate to spawn 3 agents:

1. fuse-ai-pilot:explore-codebase - Analyze existing i18n setup and translation patterns
2. fuse-ai-pilot:research-expert - Verify latest react-i18next/i18next docs via Context7/Exa
3. mcp__context7__query-docs - Check TypeScript Selector API and React 19 Suspense patterns

After implementation, run fuse-ai-pilot:sniper for validation.