Chore: remove i18n toggle (#69389)

* remove i18n toggle

* remove beta badge on language picker

* remove toggle from go code

* Revert "remove beta badge on language picker"

This reverts commit 3b76300aa7.

pkg/services/preference/prefimpl/pref.go

@@ -224,10 +224,7 @@ func (s *Service) GetDefaults() *pref.Preference {
 		HomeDashboardID: 0,
 		JSONData:        &pref.PreferenceJSONData{},
 	}
-
-	if s.features.IsEnabled(featuremgmt.FlagInternationalization) {
-		defaults.JSONData.Language = s.cfg.DefaultLanguage
-	}
+	defaults.JSONData.Language = s.cfg.DefaultLanguage
 
 	return defaults
 }

pkg/services/preference/prefimpl/pref_test.go

@@ -45,7 +45,9 @@ func TestGetDefaults(t *testing.T) {
 			Theme:           "light",
 			Timezone:        "UTC",
 			HomeDashboardID: 0,
-			JSONData:        &pref.PreferenceJSONData{},
+			JSONData: &pref.PreferenceJSONData{
+				Language: "en-US",
+			},
 		}
 		if diff := cmp.Diff(expected, preference); diff != "" {
 			t.Fatalf("Result mismatch (-want +got):\n%s", diff)
@@ -56,32 +58,6 @@ func TestGetDefaults(t *testing.T) {
 		query := &pref.GetPreferenceWithDefaultsQuery{OrgID: 1}
 		preference, err := prefService.GetWithDefaults(context.Background(), query)
 		require.NoError(t, err)
-		expected := &pref.Preference{
-			WeekStart:       &weekStart,
-			Theme:           "light",
-			Timezone:        "UTC",
-			HomeDashboardID: 0,
-			JSONData:        &pref.PreferenceJSONData{},
-		}
-		if diff := cmp.Diff(expected, preference); diff != "" {
-			t.Fatalf("Result mismatch (-want +got):\n%s", diff)
-		}
-	})
-}
-
-func TestGetDefaultsWithI18nFeatureFlag(t *testing.T) {
-	prefService := &Service{
-		store:    newFake(),
-		cfg:      setting.NewCfg(),
-		features: featuremgmt.WithFeatures(featuremgmt.FlagInternationalization),
-	}
-	weekStart := ""
-	prefService.cfg.DefaultLanguage = "en-US"
-	prefService.cfg.DefaultTheme = "light"
-	prefService.cfg.DateFormats.DefaultTimezone = "UTC"
-
-	t.Run("GetDefaults", func(t *testing.T) {
-		preference := prefService.GetDefaults()
 		expected := &pref.Preference{
 			WeekStart:       &weekStart,
 			Theme:           "light",