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/children.json

@@ -1,23 +1,44 @@
 {
-  "title": "儿童",
-  "subtitle": "管理您家庭的儿童档案",
-  "addChild": "添加儿童",
-  "addFirstChild": "添加第一个儿童",
-  "editChild": "编辑儿童",
-  "deleteChild": "删除儿童",
-  "noChildren": "还没有添加儿童",
-  "noChildrenSubtitle": "添加您的第一个儿童以开始追踪他们的活动",
+  "title": "孩子",
+  "subtitle": "管理您家庭的孩子档案",
+  "addChild": "添加孩子",
+  "addFirstChild": "添加第一个孩子",
+  "editChild": "编辑孩子",
+  "deleteChild": "删除孩子",
+  "noChildren": "还没有添加孩子",
+  "noChildrenSubtitle": "添加您的第一个孩子开始跟踪他们的活动",
   "age": "年龄",
   "gender": {
     "male": "男",
     "female": "女",
     "other": "其他"
   },
+  "dialog": {
+    "name": "姓名",
+    "birthDate": "出生日期",
+    "gender": "性别",
+    "photoUrl": "照片URL（可选）",
+    "photoPlaceholder": "https://example.com/photo.jpg",
+    "cancel": "取消",
+    "add": "添加",
+    "update": "更新",
+    "saving": "保存中...",
+    "delete": "删除",
+    "deleting": "删除中...",
+    "confirmDelete": "确认删除",
+    "confirmDeleteMessage": "您确定要删除",
+    "confirmDeleteWarning": "此操作无法撤销。所有相关数据将被永久删除。",
+    "validation": {
+      "nameRequired": "请输入姓名",
+      "birthDateRequired": "请选择出生日期",
+      "birthDateFuture": "出生日期不能是未来日期"
+    }
+  },
   "errors": {
-    "noFamily": "未找到家庭。请先完成入职流程。",
-    "loadFailed": "加载儿童失败",
-    "saveFailed": "保存儿童失败",
-    "deleteFailed": "删除儿童失败",
+    "noFamily": "未找到家庭。请先完成入门设置。",
+    "loadFailed": "加载孩子信息失败",
+    "saveFailed": "保存孩子信息失败",
+    "deleteFailed": "删除孩子失败",
     "noFamilyId": "未找到家庭ID"
   },
   "ageFormat": {
@@ -26,4 +47,4 @@
     "month": "个月",
     "months": "个月"
   }
-}
+}