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/dashboard.json

@@ -1,7 +1,7 @@
 {
-  "welcomeBack": "Bienvenido de vuelta",
-  "welcomeBackWithName": "Bienvenido de vuelta, {{name}}!",
-  "subtitle": "Rastrea las actividades de tu hijo y obtén información impulsada por IA",
+  "welcomeBack": "Bienvenido de Vuelta",
+  "welcomeBackWithName": "¡Bienvenido de vuelta, {{name}}!",
+  "subtitle": "Rastrea las actividades de tu hijo y obtén perspectivas impulsadas por IA",
   "quickActions": {
     "title": "Acciones Rápidas",
     "feeding": "Alimentación",
@@ -19,12 +19,12 @@
     "sleep": "Sueño",
     "diapers": "Pañales",
     "medications": "Medicamentos",
-    "noChild": "Agrega un niño para comenzar a rastrear",
-    "noActivities": "No hay actividades rastreadas hoy"
+    "noChild": "Agrega un niño para comenzar el seguimiento",
+    "noActivities": "No se han rastreado actividades hoy"
   },
   "predictions": {
     "title": "Próxima Actividad Predicha",
     "napTime": "Hora de siesta en {{minutes}} minutos",
     "basedOnPatterns": "Basado en los patrones de sueño de tu hijo"
   }
-}
+}