Add internationalization support with English and Dutch translations

- Integrated i18next for language detection and translation support.
- Added English and Dutch JSON translation files for various app sections.
- Updated TweaksPanel and Workspace components to use translated strings.
- Imported i18n configuration in main entry file.

frontend/src/i18n/index.ts

@@ -0,0 +1,27 @@
+import i18n from 'i18next'
+import { initReactI18next } from 'react-i18next'
+import LanguageDetector from 'i18next-browser-languagedetector'
+import en from './en.json'
+import nl from './nl.json'
+
+const resources = {
+  en: { translation: en },
+  nl: { translation: nl },
+}
+
+i18n
+  .use(LanguageDetector)
+  .use(initReactI18next)
+  .init({
+    resources,
+    fallbackLng: 'en',
+    interpolation: {
+      escapeValue: false,
+    },
+    detection: {
+      order: ['localStorage', 'navigator'],
+      caches: ['localStorage'],
+    },
+  })
+
+export default i18n