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/de/common.json

@@ -0,0 +1,79 @@
+{
+  "appName": "Maternal",
+  "appDescription": "KI-gestützter Kinderbetreuungsassistent",
+  "welcome": "Willkommen",
+  "loading": "Laden...",
+  "save": "Speichern",
+  "cancel": "Abbrechen",
+  "delete": "Löschen",
+  "edit": "Bearbeiten",
+  "add": "Hinzufügen",
+  "close": "Schließen",
+  "confirm": "Bestätigen",
+  "back": "Zurück",
+  "next": "Weiter",
+  "previous": "Vorherige",
+  "finish": "Fertig",
+  "search": "Suchen",
+  "filter": "Filtern",
+  "sort": "Sortieren",
+  "refresh": "Aktualisieren",
+  "retry": "Wiederholen",
+  "continue": "Fortfahren",
+  "submit": "Absenden",
+  "reset": "Zurücksetzen",
+  "clear": "Löschen",
+  "yes": "Ja",
+  "no": "Nein",
+  "ok": "OK",
+  "error": "Fehler",
+  "success": "Erfolg",
+  "warning": "Warnung",
+  "info": "Information",
+  "home": "Startseite",
+  "settings": "Einstellungen",
+  "profile": "Profil",
+  "logout": "Abmelden",
+  "login": "Anmelden",
+  "signup": "Registrieren",
+  "email": "E-Mail",
+  "password": "Passwort",
+  "name": "Name",
+  "date": "Datum",
+  "time": "Zeit",
+  "duration": "Dauer",
+  "notes": "Notizen",
+  "optional": "Optional",
+  "required": "Erforderlich",
+  "units": {
+    "metric": "Metrisch",
+    "imperial": "Imperial"
+  },
+  "measurements": {
+    "weight": "Gewicht",
+    "height": "Größe",
+    "temperature": "Temperatur",
+    "volume": "Volumen"
+  },
+  "navigation": {
+    "home": "Startseite",
+    "dashboard": "Dashboard",
+    "tracking": "Verfolgung",
+    "trackActivity": "Aktivität verfolgen",
+    "track": "Verfolgen",
+    "ai": "KI-Assistent",
+    "aiChat": "KI-Chat",
+    "family": "Familie",
+    "insights": "Einblicke",
+    "children": "Kinder",
+    "settings": "Einstellungen",
+    "logout": "Abmelden"
+  },
+  "connection": {
+    "syncActive": "Echtzeit-Synchronisation aktiv",
+    "syncDisconnected": "Echtzeit-Synchronisation getrennt",
+    "live": "Live",
+    "offline": "Offline",
+    "familyMembersOnline": "{{count}} Familienmitglieder online"
+  }
+}