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 = {
-  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';
-    await instance.init<i18nextBackend.FsBackendOptions>({
-      lng: supportedLang,
-      debug: true,
-      backend: {
-        loadPath: `${__dirname}/src/assets/i18n/{{lng}}.json`,
-      },
-    });
-    new LocalizationService(instance);
-  },
-  inject: ['REQUEST'],
-};
+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));
+      await instance.init<i18nextBackend.FsBackendOptions>({
+        lng: supportedLang,
+        fallbackLng: 'en',
+        debug: false,
+        backend: {
+          loadPath: `assets/i18n/{{lng}}.json`,
+        },
+      });
+      return new LocalizationService(instance);
+    },
+    inject: ['REQUEST'],
+  };
 
 export class LocalizationService {
   constructor(private readonly i18n: i18next.i18n) {}