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.

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

packages/twenty-front/src/modules/ui/navigation/navigation-drawer/components/__stories__/NavigationDrawer.stories.tsx

@@ -142,7 +142,7 @@ export const Settings: Story = {
           />
           <NavigationDrawerItem
             label="Appearance"
-            to={getSettingsPagePath(SettingsPath.Appearance)}
+            to={getSettingsPagePath(SettingsPath.Experience)}
             Icon={IconColorSwatch}
           />
           <NavigationDrawerItemGroup>