Internationalization in Next.js 16: Lessons From Supporting 10 Languages

When I decided to support 10 languages in TaleForge from day one, I knew it would be work. I didn't know it would be this much work. Here's everything I learned. The Setup Stack: Next.js 16 App Router + next-intl. Why next-intl? It plays nicely with server components, supports namespaced messages, and handles pluralization rules per locale. Languages supported: English, French, Spanish, German, Portuguese, Italian, Japanese, Chinese, Arabic, Hebrew. Yes, that includes two RTL (right-to-left) languages. Yes, that was painful. Message Organization With 10 pages, dozens of components, and modals/forms everywhere, I quickly had hundreds of translation keys. Organization was critical. I settled on one JSON file per locale with nested namespaces: { "nav": { "home": "Home", "pricing": "Pricing", "blog": "Blog" }, "landing": { "hero": { "title": "Stop fighting with tools to write your book", "subtitle": "A writing platform that works the way you think" } }, "editor": { "save": "Save", "wordCou