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/errors.json

@@ -1,69 +1,69 @@
 {
   "general": {
-    "unknown": "An unknown error occurred",
-    "networkError": "Network error. Please check your connection.",
-    "serverError": "Server error. Please try again later.",
-    "notFound": "The requested resource was not found",
-    "unauthorized": "You are not authorized to perform this action",
-    "forbidden": "Access denied",
-    "validation": "Please check your input and try again",
-    "timeout": "Request timed out. Please try again."
+    "unknown": "发生未知错误",
+    "networkError": "网络错误。请检查您的连接。",
+    "serverError": "服务器错误。请稍后重试。",
+    "notFound": "未找到请求的资源",
+    "unauthorized": "您无权执行此操作",
+    "forbidden": "访问被拒绝",
+    "validation": "请检查您的输入并重试",
+    "timeout": "请求超时。请重试。"
   },
   "auth": {
-    "invalidCredentials": "Invalid email or password",
-    "emailExists": "An account with this email already exists",
-    "emailNotVerified": "Please verify your email address",
-    "accountLocked": "Your account has been locked. Please contact support.",
-    "sessionExpired": "Your session has expired. Please sign in again.",
-    "weakPassword": "Password is too weak",
-    "tokenInvalid": "Invalid or expired token",
-    "deviceNotTrusted": "Device not trusted. Please verify your device."
+    "invalidCredentials": "邮箱或密码无效",
+    "emailExists": "此邮箱已存在账户",
+    "emailNotVerified": "请验证您的邮箱地址",
+    "accountLocked": "您的账户已被锁定。请联系支持。",
+    "sessionExpired": "您的会话已过期。请重新登录。",
+    "weakPassword": "密码太弱",
+    "tokenInvalid": "令牌无效或已过期",
+    "deviceNotTrusted": "设备不受信任。请验证您的设备。"
   },
   "family": {
-    "limitExceeded": "Family size limit exceeded",
-    "memberNotFound": "Family member not found",
-    "cannotRemoveSelf": "You cannot remove yourself from the family",
-    "insufficientPermissions": "You don't have permission to perform this action",
-    "invitationExpired": "This invitation has expired",
-    "alreadyMember": "This person is already a family member"
+    "limitExceeded": "超出家庭规模限制",
+    "memberNotFound": "未找到家庭成员",
+    "cannotRemoveSelf": "您不能将自己从家庭中移除",
+    "insufficientPermissions": "您没有权限执行此操作",
+    "invitationExpired": "此邀请已过期",
+    "alreadyMember": "此人已是家庭成员"
   },
   "child": {
-    "notFound": "Child profile not found",
-    "invalidAge": "Invalid age. Please check the date of birth.",
-    "limitExceeded": "You've reached the maximum number of children"
+    "notFound": "未找到孩子档案",
+    "invalidAge": "年龄无效。请检查出生日期。",
+    "limitExceeded": "您已达到最大孩子数量"
   },
   "tracking": {
-    "invalidData": "Invalid tracking data",
-    "futureDate": "You cannot log activities in the future",
-    "duplicateEntry": "A similar entry already exists",
-    "invalidDuration": "Invalid duration",
-    "invalidAmount": "Invalid amount"
+    "invalidData": "跟踪数据无效",
+    "futureDate": "您不能记录未来的活动",
+    "duplicateEntry": "类似条目已存在",
+    "invalidDuration": "持续时间无效",
+    "invalidAmount": "数量无效"
   },
   "ai": {
-    "dailyLimitReached": "Daily AI question limit reached",
-    "contextError": "Failed to load context for AI",
-    "responseError": "Failed to generate AI response",
-    "moderationFlag": "Your message was flagged by our content moderation system"
+    "dailyLimitReached": "已达到每日AI问题限制",
+    "contextError": "加载AI上下文失败",
+    "responseError": "生成AI回复失败",
+    "moderationFlag": "您的消息被我们的内容审核系统标记"
   },
   "offline": {
-    "noConnection": "No internet connection",
-    "syncFailed": "Failed to sync data",
-    "pendingChanges": "You have pending changes that need to be synced"
+    "noConnection": "无网络连接",
+    "syncFailed": "同步数据失败",
+    "pendingChanges": "您有待同步的更改"
   },
   "validation": {
-    "required": "This field is required",
-    "invalidEmail": "Please enter a valid email address",
-    "invalidPhone": "Please enter a valid phone number",
-    "invalidDate": "Please enter a valid date",
-    "minLength": "Must be at least {{min}} characters",
-    "maxLength": "Must be no more than {{max}} characters",
-    "minValue": "Must be at least {{min}}",
-    "maxValue": "Must be no more than {{max}}",
-    "invalidFormat": "Invalid format",
-    "passwordMismatch": "Passwords do not match"
+    "required": "此字段是必需的",
+    "invalidEmail": "请输入有效的邮箱地址",
+    "invalidPhone": "请输入有效的电话号码",
+    "invalidDate": "请输入有效的日期",
+    "minLength": "至少需要{{min}}个字符",
+    "maxLength": "不能超过{{max}}个字符",
+    "minValue": "至少需要{{min}}",
+    "maxValue": "不能超过{{max}}",
+    "invalidFormat": "格式无效",
+    "passwordMismatch": "密码不匹配"
   },
-  "retry": "Retry",
-  "goBack": "Go Back",
-  "contactSupport": "Contact Support",
-  "dismiss": "Dismiss"
-}
+  "retry": "重试",
+  "goBack": "返回",
+  "contactSupport": "联系支持",
+  "dismiss": "关闭"
+}