feat(i18n): add French language support and enhance localization

- Introduced French as a supported language across the application, updating locale files and adding translations for various components.
- Enhanced language handling logic to accommodate French, ensuring proper detection and fallback mechanisms.
- Updated UI elements to include French language options, improving accessibility for French-speaking users.
- Refactored SEO handling to include French in hreflang links, enhancing search engine indexing for multilingual content.
- Added new scripts for managing French translations and ensuring consistency across language files.

frontend/package.json

@@ -6,7 +6,10 @@
     "dev": "vite",
     "build": "vite build",
     "preview": "vite preview",
-    "optimize-models": "node scripts/optimize-glb.mjs"
+    "optimize-models": "node scripts/optimize-glb.mjs",
+    "i18n:check-parity": "node scripts/check-i18n-locale-parity.mjs de fr",
+    "i18n:translate-fr": "node scripts/generate-fr-locale-from-de.mjs",
+    "i18n:smooth-falukant-fr": "node scripts/smooth-fr-falukant.mjs"
   },
   "dependencies": {
     "@tiptap/extension-color": "^2.27.2",
@@ -36,6 +39,7 @@
     "@gltf-transform/cli": "^4.3.0",
     "@vitejs/plugin-vue": "^5.2.4",
     "assert": "^2.1.0",
+    "google-translate-api-x": "^10.7.2",
     "sass": "^1.98.0",
     "stream-browserify": "^3.0.0",
     "util": "^0.12.5",