i18n: Add locale to backend (#102233)

pkg/services/preference/prefapi/api.go

@@ -9,11 +9,12 @@ import (
 	"github.com/grafana/grafana/pkg/api/response"
 	"github.com/grafana/grafana/pkg/kinds/preferences"
 	"github.com/grafana/grafana/pkg/services/dashboards"
+	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	pref "github.com/grafana/grafana/pkg/services/preference"
 )
 
 func UpdatePreferencesFor(ctx context.Context,
-	dashboardService dashboards.DashboardService, preferenceService pref.Service,
+	dashboardService dashboards.DashboardService, preferenceService pref.Service, features featuremgmt.FeatureToggles,
 	orgID, userID, teamId int64, dtoCmd *dtos.UpdatePrefsCmd) response.Response {
 	if dtoCmd.Theme != "" && !pref.IsValidThemeID(dtoCmd.Theme) {
 		return response.Error(http.StatusBadRequest, "Invalid theme", nil)
@@ -49,6 +50,10 @@ func UpdatePreferencesFor(ctx context.Context,
 		Navbar:            dtoCmd.Navbar,
 	}
 
+	if features.IsEnabled(ctx, featuremgmt.FlagLocaleFormatPreference) {
+		saveCmd.Locale = dtoCmd.Locale
+	}
+
 	if err := preferenceService.Save(ctx, &saveCmd); err != nil {
 		return response.ErrOrFallback(http.StatusInternalServerError, "Failed to save preferences", err)
 	}
@@ -58,7 +63,7 @@ func UpdatePreferencesFor(ctx context.Context,
 
 func GetPreferencesFor(ctx context.Context,
 	dashboardService dashboards.DashboardService, preferenceService pref.Service,
-	orgID, userID, teamID int64) response.Response {
+	features featuremgmt.FeatureToggles, orgID, userID, teamID int64) response.Response {
 	prefsQuery := pref.GetPreferenceQuery{UserID: userID, OrgID: orgID, TeamID: teamID}
 
 	preference, err := preferenceService.Get(ctx, &prefsQuery)
@@ -67,7 +72,6 @@ func GetPreferencesFor(ctx context.Context,
 	}
 
 	var dashboardUID string
-
 	// when homedashboardID is 0, that means it is the default home dashboard, no UID would be returned in the response
 	if preference.HomeDashboardID != 0 {
 		query := dashboards.GetDashboardQuery{ID: preference.HomeDashboardID, OrgID: orgID}
@@ -97,6 +101,12 @@ func GetPreferencesFor(ctx context.Context,
 			dto.Language = &preference.JSONData.Language
 		}
 
+		if features.IsEnabled(ctx, featuremgmt.FlagLocaleFormatPreference) {
+			if preference.JSONData.Locale != "" {
+				dto.Locale = &preference.JSONData.Locale
+			}
+		}
+
 		if preference.JSONData.Navbar.BookmarkUrls != nil {
 			dto.Navbar = &preferences.NavbarPreference{
 				BookmarkUrls: []string{},