feat(i18n): add new i18n message files and update request config

- Add new i18n message files: audit, course-plans, files, leave, nav, practice, scheduling, student, users

- Update existing i18n messages: ai, attendance, common, diagnostic, elective, error-book, exam-homework, grades, lesson-preparation, school, settings

- Update i18n request config for new locale handling

src/shared/i18n/messages/en/diagnostic.json

@@ -185,5 +185,20 @@
     "noWeaknesses": "No weaknesses identified.",
     "reportMeta": "Period: {period} · Overall: {score}%",
     "historyReportMeta": "{date} · Overall: {score}%"
+  },
+  "parent": {
+    "title": "Children Diagnostic",
+    "description": "View your children's knowledge point mastery and diagnostic reports.",
+    "noChildren": "No children linked",
+    "noChildrenDesc": "Your account is not linked to any children. Please contact the school administrator.",
+    "selectChild": "Select a child",
+    "selectChildPlaceholder": "Choose a child to view their diagnostic data",
+    "overallMastery": "Overall Mastery",
+    "knowledgePoints": "Knowledge Points",
+    "strengths": "Strengths",
+    "weaknesses": "Weaknesses",
+    "reports": "Diagnostic Reports",
+    "noReports": "No diagnostic reports for this child yet.",
+    "mastery": "Mastery"
   }
 }