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/es/common.json

@@ -1,6 +1,6 @@
 {
   "appName": "Maternal",
-  "appDescription": "Asistente de Cuidado Infantil con IA",
+  "appDescription": "Asistente de Cuidado Infantil Impulsado por IA",
   "welcome": "Bienvenido",
   "loading": "Cargando...",
   "save": "Guardar",
@@ -33,10 +33,10 @@
   "home": "Inicio",
   "settings": "Configuración",
   "profile": "Perfil",
-  "logout": "Cerrar sesión",
-  "login": "Iniciar sesión",
+  "logout": "Cerrar Sesión",
+  "login": "Iniciar Sesión",
   "signup": "Registrarse",
-  "email": "Correo electrónico",
+  "email": "Correo Electrónico",
   "password": "Contraseña",
   "name": "Nombre",
   "date": "Fecha",
@@ -44,7 +44,7 @@
   "duration": "Duración",
   "notes": "Notas",
   "optional": "Opcional",
-  "required": "Obligatorio",
+  "required": "Requerido",
   "units": {
     "metric": "Métrico",
     "imperial": "Imperial"
@@ -57,14 +57,14 @@
   },
   "navigation": {
     "home": "Inicio",
-    "dashboard": "Panel",
+    "dashboard": "Panel de Control",
     "tracking": "Seguimiento",
-    "trackActivity": "Registrar Actividad",
-    "track": "Registrar",
+    "trackActivity": "Rastrear Actividad",
+    "track": "Rastrear",
     "ai": "Asistente IA",
     "aiChat": "Chat IA",
     "family": "Familia",
-    "insights": "Análisis",
+    "insights": "Perspectivas",
     "children": "Niños",
     "settings": "Configuración",
     "logout": "Cerrar Sesión"
@@ -73,7 +73,7 @@
     "syncActive": "Sincronización en tiempo real activa",
     "syncDisconnected": "Sincronización en tiempo real desconectada",
     "live": "En Vivo",
-    "offline": "Desconectado",
+    "offline": "Sin Conexión",
     "familyMembersOnline": "{{count}} miembros de la familia en línea"
   }
-}
+}