message: Bugfix variable renamed
diff: [lectureId]="lecture._id"
  [onDone]="onDone"
  [onCancel]="onCancel"></app-task-unit-edit>
  - <app-free-text-unit-form *ngIf="course && unitType == 'free-text'"
  + <app-free-text-unit-form *ngIf="course && type == 'free-text'"
  [course]="course"
  [model]="model"
  [lectureId]="lecture._id"
  