message: Removes an unnecessary letter...
diff: <div *ngIf="role == 'student'">
  - <md-input-container>l
  + <md-input-container>
  <input mdInput formControlName="uid" placeholder="Matriculation number"/>
  <div *ngIf="registerForm.controls.uid.touched">
  <small *ngIf="registerForm.controls.uid.hasError('required')" class="text-danger">Matriculation number is
  