message: Add sent email
diff: <span *ngIf="isCurrentProfile()">{{user.profile.firstName}} {{user.profile.lastName}}</span>
  </h3>
  <div class="user-data">
  - <span><strong>E-Mail:</strong> {{user.email}}</span>
  + <span><strong>E-Mail:</strong> <a href="mailto:{{user.email}}">{{user.email}}</a></span>
  <span *ngIf="canSeeUid()">
  <strong>Matrikelnummer:</strong> {{user.uid}}
  </span>
  