message: Fix "Fit It"-tab label for coding challenges
diff: </mat-tab>
  <mat-tab [disabled]="lockIcon() === 'lock'">
  <ng-template mat-tab-label>
  - {{'TAB_FIND_IT' | translate}}
  + {{'TAB_FIX_IT' | translate}}
  <mat-icon class="materaial-icons-outlined" [color]="lockColor()">{{lockIcon()}}</mat-icon>
  </ng-template>
  <!-- <mat-divider></mat-divider> -->
  