Laravel Multilang with Inertia + React: A Real-World Guide

So you're building a Laravel + Inertia + React app and you need it to speak more than one language. Maybe your client wants both English and Indonesian. Maybe your boss just told you "make it multilingual" and walked away. Either way — welcome to this guide. We're going to walk through a real implementation from an actual accounting app that serves both English and Indonesian users. No toy examples. No "hello world" translations. Actual production patterns that cover edge cases you'll definitely hit. Let's go. Table of Contents Why Multilang is Trickier with Inertia The Stack Step 1: Install laravel-react-i18n Step 2: Wire Up the Provider in app.tsx Step 3: Pass Locale from Laravel to React Step 4: Structure Your Translation Files Step 5: Use Translations in React Components Step 6: Dynamic Values in Translations Step 7: Build a Language Switcher Step 8: Persist Locale Across Sessions Step 9: Translations in the Backend File Organization Patterns Gotchas and Things That Will Bite You C