feat: Apply localization to Track and Children pages (Phase 9 - Batch 2)

**Pages Localized:**
- Track main page: Activity selection menu with all tracking options
- Children page: Complete localization including age formatting with pluralization

**Translation Files:**
- Enhanced tracking.json: Added trackActivity, selectActivity, and activities keys
- Created children.json for all 5 languages with comprehensive strings
- Updated i18n config to include children namespace

**Key Features:**
- Localized age calculation with proper pluralization (year/years, month/months)
- All error messages translated
- Gender labels localized
- Properly formatted age display for all languages

**Languages Supported:**
- English, Spanish, French, Portuguese, Chinese (Simplified)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

maternal-web/locales/en/children.json

@@ -0,0 +1,29 @@
+{
+  "title": "Children",
+  "subtitle": "Manage your family's children profiles",
+  "addChild": "Add Child",
+  "addFirstChild": "Add First Child",
+  "editChild": "Edit Child",
+  "deleteChild": "Delete Child",
+  "noChildren": "No children added yet",
+  "noChildrenSubtitle": "Add your first child to start tracking their activities",
+  "age": "Age",
+  "gender": {
+    "male": "Male",
+    "female": "Female",
+    "other": "Other"
+  },
+  "errors": {
+    "noFamily": "No family found. Please complete onboarding first.",
+    "loadFailed": "Failed to load children",
+    "saveFailed": "Failed to save child",
+    "deleteFailed": "Failed to delete child",
+    "noFamilyId": "No family ID found"
+  },
+  "ageFormat": {
+    "year": "year",
+    "years": "years",
+    "month": "month",
+    "months": "months"
+  }
+}

maternal-web/locales/en/tracking.json

@@ -1,5 +1,14 @@
 {
   "title": "Activity Tracking",
+  "trackActivity": "Track Activity",
+  "selectActivity": "Select an activity to track",
+  "activities": {
+    "feeding": "Feeding",
+    "sleep": "Sleep",
+    "diaper": "Diaper",
+    "medicine": "Medicine",
+    "activity": "Activity"
+  },
   "feeding": {
     "title": "Feeding",
     "addFeeding": "Add Feeding",

maternal-web/locales/es/children.json

@@ -0,0 +1,29 @@
+{
+  "title": "Niños",
+  "subtitle": "Gestiona los perfiles de los niños de tu familia",
+  "addChild": "Agregar Niño",
+  "addFirstChild": "Agregar Primer Niño",
+  "editChild": "Editar Niño",
+  "deleteChild": "Eliminar Niño",
+  "noChildren": "Aún no se han agregado niños",
+  "noChildrenSubtitle": "Agrega tu primer niño para comenzar a rastrear sus actividades",
+  "age": "Edad",
+  "gender": {
+    "male": "Masculino",
+    "female": "Femenino",
+    "other": "Otro"
+  },
+  "errors": {
+    "noFamily": "No se encontró familia. Por favor completa la incorporación primero.",
+    "loadFailed": "Error al cargar niños",
+    "saveFailed": "Error al guardar niño",
+    "deleteFailed": "Error al eliminar niño",
+    "noFamilyId": "No se encontró ID de familia"
+  },
+  "ageFormat": {
+    "year": "año",
+    "years": "años",
+    "month": "mes",
+    "months": "meses"
+  }
+}

maternal-web/locales/es/tracking.json

@@ -1,5 +1,14 @@
 {
-  "title": "Activity Tracking",
+  "title": "Seguimiento de Actividades",
+  "trackActivity": "Registrar Actividad",
+  "selectActivity": "Selecciona una actividad para registrar",
+  "activities": {
+    "feeding": "Alimentación",
+    "sleep": "Sueño",
+    "diaper": "Pañal",
+    "medicine": "Medicina",
+    "activity": "Actividad"
+  },
   "feeding": {
     "title": "Feeding",
     "addFeeding": "Add Feeding",

maternal-web/locales/fr/children.json

@@ -0,0 +1,29 @@
+{
+  "title": "Enfants",
+  "subtitle": "Gérez les profils des enfants de votre famille",
+  "addChild": "Ajouter un Enfant",
+  "addFirstChild": "Ajouter le Premier Enfant",
+  "editChild": "Modifier l'Enfant",
+  "deleteChild": "Supprimer l'Enfant",
+  "noChildren": "Aucun enfant ajouté pour le moment",
+  "noChildrenSubtitle": "Ajoutez votre premier enfant pour commencer à suivre ses activités",
+  "age": "Âge",
+  "gender": {
+    "male": "Masculin",
+    "female": "Féminin",
+    "other": "Autre"
+  },
+  "errors": {
+    "noFamily": "Aucune famille trouvée. Veuillez d'abord terminer l'intégration.",
+    "loadFailed": "Échec du chargement des enfants",
+    "saveFailed": "Échec de l'enregistrement de l'enfant",
+    "deleteFailed": "Échec de la suppression de l'enfant",
+    "noFamilyId": "Aucun ID de famille trouvé"
+  },
+  "ageFormat": {
+    "year": "an",
+    "years": "ans",
+    "month": "mois",
+    "months": "mois"
+  }
+}

maternal-web/locales/fr/tracking.json

@@ -1,5 +1,14 @@
 {
-  "title": "Activity Tracking",
+  "title": "Suivi des Activités",
+  "trackActivity": "Enregistrer une Activité",
+  "selectActivity": "Sélectionnez une activité à suivre",
+  "activities": {
+    "feeding": "Alimentation",
+    "sleep": "Sommeil",
+    "diaper": "Couche",
+    "medicine": "Médicament",
+    "activity": "Activité"
+  },
   "feeding": {
     "title": "Feeding",
     "addFeeding": "Add Feeding",

maternal-web/locales/pt/children.json

@@ -0,0 +1,29 @@
+{
+  "title": "Crianças",
+  "subtitle": "Gerencie os perfis das crianças da sua família",
+  "addChild": "Adicionar Criança",
+  "addFirstChild": "Adicionar Primeira Criança",
+  "editChild": "Editar Criança",
+  "deleteChild": "Excluir Criança",
+  "noChildren": "Nenhuma criança adicionada ainda",
+  "noChildrenSubtitle": "Adicione sua primeira criança para começar a rastrear suas atividades",
+  "age": "Idade",
+  "gender": {
+    "male": "Masculino",
+    "female": "Feminino",
+    "other": "Outro"
+  },
+  "errors": {
+    "noFamily": "Nenhuma família encontrada. Por favor, complete a integração primeiro.",
+    "loadFailed": "Falha ao carregar crianças",
+    "saveFailed": "Falha ao salvar criança",
+    "deleteFailed": "Falha ao excluir criança",
+    "noFamilyId": "Nenhum ID de família encontrado"
+  },
+  "ageFormat": {
+    "year": "ano",
+    "years": "anos",
+    "month": "mês",
+    "months": "meses"
+  }
+}

maternal-web/locales/pt/tracking.json

@@ -1,5 +1,14 @@
 {
-  "title": "Activity Tracking",
+  "title": "Rastreamento de Atividades",
+  "trackActivity": "Registrar Atividade",
+  "selectActivity": "Selecione uma atividade para rastrear",
+  "activities": {
+    "feeding": "Alimentação",
+    "sleep": "Sono",
+    "diaper": "Fralda",
+    "medicine": "Remédio",
+    "activity": "Atividade"
+  },
   "feeding": {
     "title": "Feeding",
     "addFeeding": "Add Feeding",

maternal-web/locales/zh/children.json

@@ -0,0 +1,29 @@
+{
+  "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",
+  "age": "年龄",
+  "gender": {
+    "male": "男",
+    "female": "女",
+    "other": "其他"
+  },
+  "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",
+    "noFamilyId": "未找到家庭ID"
+  },
+  "ageFormat": {
+    "year": "年",
+    "years": "年",
+    "month": "个月",
+    "months": "个月"
+  }
+}

maternal-web/locales/zh/tracking.json

@@ -1,5 +1,14 @@
 {
-  "title": "Activity Tracking",
+  "title": "活动追踪",
+  "trackActivity": "记录活动",
+  "selectActivity": "选择要追踪的活动",
+  "activities": {
+    "feeding": "喂养",
+    "sleep": "睡眠",
+    "diaper": "尿布",
+    "medicine": "药物",
+    "activity": "活动"
+  },
   "feeding": {
     "title": "Feeding",
     "addFeeding": "Add Feeding",