All error messages in german and in englisch

app.js

@@ -3,11 +3,34 @@ import logger from 'morgan'
 import express from 'express'
 import cookieParser from 'cookie-parser'
 import cors from 'cors'
+import i18next from 'i18next'
+import i18nextMiddleware from 'i18next-http-middleware'
+import Backend from 'i18next-node-fs-backend'
+
+const app = express()
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = path.dirname(__filename);
 
 import indexRouter from './routes/index.js'
 import { apiRouter } from './routes/api.js'
+import {fileURLToPath} from "url";
+import path from "path";
 
-const app = express()
+
+i18next
+    .use(Backend)
+    .use(i18nextMiddleware.LanguageDetector)
+    .init({
+      backend: {
+        loadPath: __dirname + '/locales/{{lng}}/{{ns}}.json'
+      },
+      fallbackLng: 'de',
+      debug: false,
+      preload: ['de', 'en']
+    });
+
+app.use(i18nextMiddleware.handle(i18next));
 
 app.use(cors())
 app.use(logger('dev'))