feat: Enhance task filtering, smart scheduling, audit logs and translations

implementation_plan.md

@@ -60,3 +60,46 @@ Implement a "Reward Shop" where users can spend their hard-earned XP on virtual
 1. **Browse**: Check if rewards load in the new tab.
 2. **Buy (Success)**: Click buy on an affordable item -> XP decreases, item marked owned.
 3. **Buy (Fail)**: Click buy on expensive item -> Error toast "Not enough XP".
+
+# Localization Polish & E2E Testing Plan
+
+## Goal
+address the user's request to polish localization (Audit Logs) and add E2E tests for Recurring Tasks and Data Export.
+
+## Proposed Changes
+
+### Localization
+#### [MODIFY] [en.json](file:///Users/paul/Development/task-manager/client/src/i18n/locales/en.json) & [de.json](file:///Users/paul/Development/task-manager/client/src/i18n/locales/de.json)
+- Add `audit` section with translations for:
+    - Actions: `CREATE`, `UPDATE`, `DELETE`, `COMPLETE`, `GENERATE_API_KEY`, `REVOKE_API_KEY`, `EXPORT_DATA`, `LOGIN`, `LOGOUT`
+    - Entities: `TASK`, `USER`, `LABEL`, `SETTINGS`, `AI_CONFIG`, `MCP`
+    - Sources: `WEB`, `AI`, `SYSTEM`, `Unknown`
+
+#### [MODIFY] [AuditLogsTable.tsx](file:///Users/paul/Development/task-manager/client/src/components/admin/AuditLogsTable.tsx)
+- Use `t('audit.action.' + log.action)` for lookup.
+- Use `t('audit.entity.' + log.entityType)`.
+- Use `t('audit.source.' + log.source)`.
+- Use localized date formatting (maybe `Intl.DateTimeFormat` or `date-fns` with `de` locale from `date-fns/locale`).
+
+### E2E Testing
+#### [NEW] [tests/e2e/recurring_tasks.spec.ts](file:///Users/paul/Development/task-manager/tests/e2e/recurring_tasks.spec.ts)
+- Test Case:
+    1.  Login as User.
+    2.  Create Task "Recurring Task Test" with Recurrence: Daily, Every 1 Day.
+    3.  Verify task appears with recurrence icon.
+    4.  Complete task.
+    5.  Verify original is "Done".
+    6.  Verify NEW task "Recurring Task Test" appears (Due tomorrow).
+
+#### [NEW] [tests/e2e/data_export.spec.ts](file:///Users/paul/Development/task-manager/tests/e2e/data_export.spec.ts)
+- Test Case:
+    1.  Login as User.
+    2.  Nav to Settings.
+    3.  Intercept `POST /api/user/export`.
+    4.  Click "Export Data".
+    5.  Verify request payload (includes tasks, labels).
+    6.  Verify response status 200 and JSON structure.
+
+## Verification
+- Run `npm run test:e2e` (or specific specs).
+- Manual check of Audit Logs page.