Fix errors

src/app/components/fragments/content-likert-creator/content-likert-creator.component.html

-<form (ngSubmit)="submitContent(submitContent(subject.value, body.value, group.value))">
+<form (ngSubmit)="submitContent(subject.value, body.value, group.value)">
   <mat-form-field class="input-block">
     <input matInput #subject [(ngModel)]="content.subject" placeholder="{{ 'content.subject' | translate }}" name="subject">
   </mat-form-field>

src/app/components/fragments/content-yes-no-creator/content-yes-no-creator.component.html

-<form (ngSubmit)="submitContent(submitContent(subject.value, body.value, group.value))">
+<form (ngSubmit)="submitContent(subject.value, body.value, group.value)">
   <mat-form-field class="input-block">
     <input matInput #subject [(ngModel)]="content.subject" placeholder="{{ 'content.subject' | translate }}" name="subject">
   </mat-form-field>