chore: setup i18next configuration with 9 language support

apps/react/src/app/i18n/i18n.ts

@@ -0,0 +1,43 @@
+import i18n from 'i18next'
+import HttpBackend from 'i18next-http-backend'
+import { initReactI18next } from 'react-i18next'
+
+// Language detection logic (simplified without additional dependency)
+const getInitialLanguage = (): string => {
+  // Try to get from localStorage
+  const stored = localStorage.getItem('i18nextLng')
+  if (stored) return stored
+
+  // Try to get from navigator
+  const nav = navigator.language || (navigator as any).userLanguage
+  const userLang = nav.split('-')[0]
+
+  // Check if user language is supported
+  const supportedLanguages = ['ru', 'en', 'es', 'fr', 'it', 'ja', 'ko', 'de', 'zh']
+  if (supportedLanguages.includes(userLang)) {
+    return userLang
+  }
+
+  // Default to Russian
+  return 'ru'
+}
+
+i18n
+  .use(HttpBackend)
+  .use(initReactI18next)
+  .init({
+    fallbackLng: 'ru',
+    lng: getInitialLanguage(),
+    detection: {
+      order: ['localStorage', 'navigator'],
+      caches: ['localStorage'],
+    },
+    backend: {
+      loadPath: '/assets/i18n/{{lng}}.json',
+    },
+    interpolation: {
+      escapeValue: false,
+    },
+  })
+
+export default i18n

apps/react/src/main.tsx

@@ -1,3 +1,4 @@
+import './app/i18n/i18n'
 import ReactDOM from 'react-dom/client'
 import App from './app/App'
 import './styles/index.scss'