refactor: change meta class structure to include types.

Introduce requiredness of translations via implemented interface.

src/core/things/Floor.ts

@@ -13,9 +13,9 @@
  * this program. If not, see <https://www.gnu.org/licenses/>.
  */
 import {Feature, FeatureCollection, GeometryObject, LineString} from 'geojson';
-import {SCThingInPlace} from '../base/ThingInPlace';
+import {SCThingInPlace, SCThingInPlaceMeta} from '../base/ThingInPlace';
 import {SCThing, SCThingMeta, SCThingTranslatableProperties, SCThingType} from '../Thing';
-import {SCTranslations} from '../types/i18n';
+import {SCMetaTranslations, SCTranslations} from '../types/i18n';
 import {SCPointOfInterestWithoutReferences} from './PointOfInterest';
 import {SCRoomWithoutReferences} from './Room';
 
@@ -61,12 +61,6 @@ export interface SCFloor extends SCFloorWithoutReferences, SCThingInPlace {
   type: SCThingType.Floor;
 }
 
-/**
- * Meta information about a floor
- */
-export class SCFloorMeta extends SCThingMeta {
-}
-
 /**
  * A feature collection
  */
@@ -98,3 +92,34 @@ export interface SCFloorTranslatableProperties extends SCThingTranslatableProper
    */
   floorName?: string;
 }
+
+/**
+ * Meta information about floors
+ */
+export class SCFloorMeta extends SCThingMeta implements SCMetaTranslations<SCFloor> {
+  /**
+   * Translations of fields
+   */
+  fieldTranslations = {
+    de: {
+      ... SCThingInPlaceMeta.getInstance().fieldTranslations.de,
+    },
+    en: {
+      ... SCThingInPlaceMeta.getInstance().fieldTranslations.en,
+    },
+  };
+
+  /**
+   * Translations of values of fields
+   */
+  fieldValueTranslations  = {
+    de: {
+      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.de,
+      type: 'Etage',
+    },
+    en: {
+      ... SCThingInPlaceMeta.getInstance().fieldValueTranslations.en,
+      type: SCThingType.Floor,
+    },
+  };
+}