message: minor fixes the encryption screen template
diff: </div>
  <div class="panel panel-default">
  <div class="panel-body">
  - <ngb-tabset type="pills" class="nav-fill">
  + <ngb-tabset type="tabs" class="nav-fill">
  <ngb-tab title="Encrypt" id="encrypt">
  <template ngbTabContent>
  <form>
  required
  [(ngModel)]="encryptedText" name="decryptText"
  #name="ngModel"></textarea>
  - <button type="submit" class="btn btn-success" (click)="decrypt()">Decrypt</button>
  + <button type="submit" class="btn btn-success" [disabled]="encryptedText === ''" (click)="decrypt()">Decrypt</button>
  </form>
  </template>
  </ngb-tab>
  <h3>Result:</h3>
  <pre class="code-block">{{result}}</pre>
  </div>
  - <jhi-alert-error>Please make sure the encryption key is setup correctly.</jhi-alert-error>
  + <jhi-alert-error></jhi-alert-error>
  </div>
  <div class="text-center pad" >
  