fix translation init

apps/backend/nest-cli.json

@@ -3,6 +3,9 @@
   "collection": "@nestjs/schematics",
   "sourceRoot": "src",
   "compilerOptions": {
-    "deleteOutDir": true
+    "deleteOutDir": true,
+    "assets": [
+      { "include": "assets/**/*", "watchAssets": true }
+    ]
   }
 }

apps/backend/src/services/localization/localization.service.ts

@@ -6,24 +6,27 @@ import * as i18nextBackend from 'i18next-fs-backend';
 
 export const LOCALIZATION_SERVICE = 'LOCALIZATION_SERVICE';
 
-export const localizationServiceProvider: FactoryProvider = {
+export const localizationServiceProvider: FactoryProvider<LocalizationService> =
+  {
     provide: LOCALIZATION_SERVICE,
     scope: Scope.REQUEST,
     useFactory: async (req: Request) => {
       const instance = i18next.createInstance().use(i18nextBackend as any);
-    const supportedLang =
-      req.acceptsLanguages().find((l) => isSupportedLang(l)) ?? 'fr';
+      const supportedLang = req
+        .acceptsLanguages()
+        .find((l) => isSupportedLang(l));
       await instance.init<i18nextBackend.FsBackendOptions>({
         lng: supportedLang,
-      debug: true,
+        fallbackLng: 'en',
+        debug: false,
         backend: {
-        loadPath: `${__dirname}/src/assets/i18n/{{lng}}.json`,
+          loadPath: `assets/i18n/{{lng}}.json`,
         },
       });
-    new LocalizationService(instance);
+      return new LocalizationService(instance);
     },
     inject: ['REQUEST'],
-};
+  };
 
 export class LocalizationService {
   constructor(private readonly i18n: i18next.i18n) {}