refactor: remove SCMetaTranslations singletons

src/things/abstract/thing-with-categories.ts

@@ -120,22 +120,17 @@ export interface SCThingWithCategoriesSpecificValues {
 export class SCThingWithCategoriesWithoutReferencesMeta<T, U>
   implements SCMetaTranslations<SCThingWithCategoriesWithoutReferences<T, U>> {
 
-  /**
-   * Instance
-   */
-  protected static _instance = new Map<string, unknown>();
-
   /**
    * Translations of fields
    */
   fieldTranslations = {
     de: {
-      ...SCThingMeta.getInstance<SCThingMeta>().fieldTranslations.de,
+      ...new SCThingMeta().fieldTranslations.de,
       categories: 'Kategorien',
       categorySpecificValues: 'besondere Kategorien',
     },
     en: {
-      ...SCThingMeta.getInstance<SCThingMeta>().fieldTranslations.en,
+      ...new SCThingMeta().fieldTranslations.en,
       categories: 'categories',
       categorySpecificValues: 'category with specific values',
     },
@@ -146,27 +141,10 @@ export class SCThingWithCategoriesWithoutReferencesMeta<T, U>
    */
   fieldValueTranslations = {
     de: {
-      ...SCThingMeta.getInstance<SCThingMeta>().fieldValueTranslations.de,
+      ...new SCThingMeta().fieldValueTranslations.de,
     },
     en: {
-      ...SCThingMeta.getInstance<SCThingMeta>().fieldValueTranslations.en,
+      ...new SCThingMeta().fieldValueTranslations.en,
     },
   };
-
-  // tslint:disable:static-this
-  /**
-   * Function to retrieve typed singleton instance (including generics)
-   */
-  public static getInstance<T, U>(): SCThingWithCategoriesWithoutReferencesMeta<T, U> {
-    if (!SCThingWithCategoriesWithoutReferencesMeta._instance.has(this.name)) {
-      SCThingWithCategoriesWithoutReferencesMeta._instance
-        .set(this.name, new SCThingWithCategoriesWithoutReferencesMeta<T, U>());
-    }
-
-    return SCThingWithCategoriesWithoutReferencesMeta._instance
-      .get(this.name) as SCThingWithCategoriesWithoutReferencesMeta<T, U>;
-  }
-
-  protected constructor() {
-  }
 }