fix content format

src/app/models/content-type.enum.ts

 export enum ContentType {
-  CHOICE,
-  BINARY,
-  SCALE,
-  NUMBER,
-  TEXT,
-  GRID
+  CHOICE = 'CHOICE',
+  BINARY = 'BINARY',
+  SCALE = 'SCALE',
+  NUMBER = 'NUMBER',
+  TEXT = 'TEXT',
+  GRID = 'GRID'
 }

src/app/services/http/content.service.ts

@@ -36,7 +36,7 @@ export class ContentService extends BaseHttpService {
     const connectionUrl = this.apiUrl.base + this.apiUrl.content + '/';
     return this.http.post<Content>(connectionUrl,
       { roomId: content.roomId, subject: content.subject, body: content.body,
-        type: 'Content', format: content.format, group: 'preparation' },
+        format: content.format, group: 'preparation' },
       httpOptions).pipe(
       catchError(this.handleError<Content>('addContent'))
     );
@@ -46,7 +46,7 @@ export class ContentService extends BaseHttpService {
     const connectionUrl = this.apiUrl.base + this.apiUrl.content + '/';
     return this.http.post<ContentChoice>(connectionUrl,
       { roomId: contentChoice.roomId, subject: contentChoice.subject, body: contentChoice.body,
-        type: 'ChoiceContent', format: contentChoice.format, group: 'preparation' },
+        format: contentChoice.format, group: 'preparation' },
       httpOptions).pipe(
       catchError(this.handleError<ContentChoice>('addContent'))
     );