Corrected exercise-model attribute to 'creator'

src/main/webapp/app/search/search.component.ts

@@ -75,7 +75,7 @@ export class SearchComponent implements OnInit {
       description: searchResult.metadata.description,
       programmingLanguages: searchResult.metadata.programmingLanguage,
       languages: searchResult.metadata.language,
-      creators: searchResult.metadata.creator,
+      creator: searchResult.metadata.creator,
       contributor: searchResult.metadata.contributor,
       publisher: searchResult.metadata.publisher,
       imageURL: searchResult.metadata.image,

src/main/webapp/app/shared/model/artemis-exercise-info.model.ts

@@ -10,7 +10,7 @@ export enum ExerciseMode {
 export class ArtemisExerciseInfo implements Exercise {
   constructor(
     public contributor: Person[],
-    public creators: Person[],
+    public creator: Person[],
     public deprecated: boolean,
     public description: string,
     public downloads: number,

src/main/webapp/app/shared/model/exercise.model.ts

@@ -34,7 +34,7 @@ export interface Exercise {
   description: string;
   programmingLanguages: string[];
   languages: string[];
-  creators: Person[];
+  creator: Person[];
   publisher: Person[];
   contributor: Person[];
   requires: string[];