fix(i18n): translations

- Added translation support using react-i18next in WafConfig and CrowdSecConfig components.
- Updated UI elements to use translation keys instead of hardcoded strings.
- Enhanced test coverage for i18n integration, including mocks for translation in tests.
- Fixed various test cases to align with new translation structure.
- Created a QA report for i18n implementation, noting validation of translation files and areas for improvement.

frontend/src/pages/__tests__/SystemSettings.test.tsx

@@ -9,16 +9,7 @@ import * as featureFlagsApi from '../../api/featureFlags'
 import client from '../../api/client'
 import { LanguageProvider } from '../../context/LanguageContext'
 
-// Mock i18next
-vi.mock('react-i18next', () => ({
-  useTranslation: () => ({
-    t: (key: string) => key,
-    i18n: {
-      changeLanguage: vi.fn(),
-      language: 'en',
-    },
-  }),
-}))
+// Note: react-i18next mock is provided globally by src/test/setup.ts
 
 // Mock API modules
 vi.mock('../../api/settings', () => ({