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>

.gitignore

@@ -18,6 +18,7 @@
 !.yarn/sdks
 !.yarn/versions
 .vercel
+.swc
 
 **/**/logs/**