feat: use tag @validatable to mark schema types

src/core/things/Setting.ts

@@ -13,11 +13,12 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {
-  SCThingWithCategoriesSpecificValues, SCThingWithCategoriesTranslatableProperties,
+  SCThingWithCategoriesSpecificValues,
+  SCThingWithCategoriesTranslatableProperties,
   SCThingWithCategoriesWithoutReferences,
 } from '../base/ThingWithCategories';
 import {SCThingMeta, SCThingType} from '../Thing';
-import { SCTranslations } from '../types/i18n';
+import {SCTranslations} from '../types/i18n';
 
 export type SCSettingCategories = string;
 
@@ -56,6 +57,8 @@ export type SCSettingInputType = SCSettingSingleChoice
 
 /**
  * A setting with references
+ *
+ * @validatable
  */
 export interface SCSetting extends SCSettingWithoutReferences {
   /**