build ok,

002_source/cms/src/lib/check-is-development.ts

@@ -0,0 +1,2 @@
+const isDevelopment = process.env.NEXT_PUBLIC_ENVIRONMENT === 'development';
+export default isDevelopment;

002_source/cms/src/lib/i18n.ts

@@ -1,12 +1,26 @@
 import { use } from 'i18next';
+import LanguageDetector from 'i18next-browser-languagedetector';
 import Backend from 'i18next-http-backend';
 import { initReactI18next } from 'react-i18next';
 
+// import { reactI18nextModule } from "react-i18next";
+
 import { logger } from '@/lib/default-logger';
 
+//
+//   .
+//   .use(detector)
+// use(detector);
 export const i18n = use(Backend)
+  .use(LanguageDetector)
   .use(initReactI18next)
-  .init({ lng: 'en', fallbackLng: 'en', interpolation: { escapeValue: false } })
+  .init({
+    // lng: 'en',
+    // fallbackLng: 'en',
+    debug: true,
+    interpolation: { escapeValue: false },
+    //
+  })
   .catch((err) => {
     logger.error('Failed to initialize i18n', err);
   });