feat(localization): add i18next configuration and CLI commands for localization management

frontend/i18next.config.ts

@@ -0,0 +1,23 @@
+import { defineConfig } from 'i18next-cli';
+
+export default defineConfig({
+  locales: ['en', 'de', 'nl', 'pt', 'ru', 'fr'],
+
+  extract: {
+    input: ['src/**/*.{ts,tsx,js,jsx}', '!src/**/*.{test,spec,d}.{ts,tsx}'],
+    output: 'src/i18n/locales/{{language}}.json',
+    defaultNS: false,
+
+    primaryLanguage: 'en',
+
+    removeUnusedKeys: true,
+
+    // Dynamic keys to preserve (e.g.: t(`errors.${code}`))
+    preservePatterns: [],
+
+    preserveContextVariants: true,
+
+    indentation: 2,
+    sort:false
+  },
+});