Set up localization with feature flag control (#9649)

Refers #8128 

Changes Introduced:
- Added i18n configuration.
- Added a feature flag for localization.
- Enabled language switching based on the flag.

---------

Co-authored-by: Félix Malfait <felix@twenty.com>

packages/twenty-front/src/utils/__tests__/title-utils.test.ts

@@ -15,8 +15,8 @@ describe('title-utils', () => {
     expect(getPageTitleFromPath('/settings/profile')).toBe(
       SettingsPageTitles.Profile,
     );
-    expect(getPageTitleFromPath('/settings/appearance')).toBe(
-      SettingsPageTitles.Appearance,
+    expect(getPageTitleFromPath('/settings/experience')).toBe(
+      SettingsPageTitles.Experience,
     );
     expect(getPageTitleFromPath('/settings/accounts')).toBe(
       SettingsPageTitles.Accounts,