feat: Complete Spanish, French, Portuguese, Chinese localization and add German/Italian support

- Updated all Spanish (es) translation files with comprehensive translations for tracking, AI, family, insights, children, and settings pages
- Updated French (fr), Portuguese (pt), and Chinese (zh) translations to match English structure
- Added German (de) and Italian (it) language support with complete translation files
- Fixed medicine tracker route from /track/medication to /track/medicine
- Updated i18n config to support 7 languages: en, es, fr, pt, zh, de, it
- All tracking pages now fully localized: sleep, feeding, diaper, medicine, activity
- AI assistant interface fully translated with thinking messages and suggested questions
- Family management and insights pages now support all languages

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/locales/fr/common.json

@@ -1,6 +1,6 @@
 {
   "appName": "Maternal",
-  "appDescription": "Assistant de Garde d'Enfants Alimenté par l'IA",
+  "appDescription": "Assistant de Soins Infantiles Alimenté par l'IA",
   "welcome": "Bienvenue",
   "loading": "Chargement...",
   "save": "Enregistrer",
@@ -37,14 +37,14 @@
   "login": "Connexion",
   "signup": "S'inscrire",
   "email": "E-mail",
-  "password": "Mot de passe",
+  "password": "Mot de Passe",
   "name": "Nom",
   "date": "Date",
   "time": "Heure",
   "duration": "Durée",
   "notes": "Notes",
   "optional": "Optionnel",
-  "required": "Obligatoire",
+  "required": "Requis",
   "units": {
     "metric": "Métrique",
     "imperial": "Impérial"
@@ -57,14 +57,14 @@
   },
   "navigation": {
     "home": "Accueil",
-    "dashboard": "Tableau de bord",
+    "dashboard": "Tableau de Bord",
     "tracking": "Suivi",
-    "trackActivity": "Enregistrer l'Activité",
-    "track": "Enregistrer",
+    "trackActivity": "Suivre l'Activité",
+    "track": "Suivre",
     "ai": "Assistant IA",
     "aiChat": "Chat IA",
     "family": "Famille",
-    "insights": "Analyses",
+    "insights": "Aperçus",
     "children": "Enfants",
     "settings": "Paramètres",
     "logout": "Déconnexion"
@@ -76,4 +76,4 @@
     "offline": "Hors Ligne",
     "familyMembersOnline": "{{count}} membres de la famille en ligne"
   }
-}
+}