message: Renames code-kata fab btn
diff: <div *ngIf="isLectureOpen()" (click)="onImportUnit()">Import unit</div>
  <div *ngIf="isLectureOpen()" (click)="onAddUnit('task')">Add tasks</div>
  <div *ngIf="isLectureOpen()" (click)="onAddUnit('file')">Add files</div>
  - <div *ngIf="isLectureOpen()" (click)="onAddUnit('code-kata')">Add Code-Kata</div>
  + <div *ngIf="isLectureOpen()" (click)="onAddUnit('code-kata')">Add code-kata</div>
  <div *ngIf="isLectureOpen()" (click)="onAddUnit('video')">Add videos</div>
  <div *ngIf="isLectureOpen()" (click)="onAddUnit('free-text')">Add free text</div>
  <div (click)="onImportLecture()">Import lecture</div>
  