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/zh/dashboard.json

@@ -1,7 +1,7 @@
 {
   "welcomeBack": "欢迎回来",
   "welcomeBackWithName": "欢迎回来，{{name}}！",
-  "subtitle": "追踪您孩子的活动并获得AI驱动的见解",
+  "subtitle": "跟踪您孩子的活动并获得AI驱动的洞察",
   "quickActions": {
     "title": "快速操作",
     "feeding": "喂养",
@@ -15,16 +15,16 @@
   "summary": {
     "title": "今日总结",
     "titleWithChild": "今日总结 - {{childName}}",
-    "feedings": "喂养次数",
+    "feedings": "喂养",
     "sleep": "睡眠",
     "diapers": "尿布",
     "medications": "药物",
-    "noChild": "添加孩子以开始追踪",
-    "noActivities": "今天没有追踪任何活动"
+    "noChild": "添加孩子开始跟踪",
+    "noActivities": "今天没有跟踪活动"
   },
   "predictions": {
     "title": "下一个预测活动",
-    "napTime": "{{minutes}}分钟后小睡时间",
+    "napTime": "{{minutes}}分钟后午睡时间",
     "basedOnPatterns": "基于您孩子的睡眠模式"
   }
-}
+}