message: display config source properties as json
diff: <form #form="ngForm" (ngSubmit)="refresh()">
  <div class="form-group">
  <label for="profile"><strong>Application</strong></label>
  - <input type="text" class="form-control" id="application" [(ngModel)]="application" name="application" required>
  + <input type="text" class="form-control" id="application" [(ngModel)]="application" name="application"
  + required>
  </div>
  <div class="form-group">
  <td>{{ index }}</td>
  <td>
  <ul>
  - <li *ngFor="let prop of getKeys(source)">{{ prop }}: {{ source[prop] }}</li>
  + <li *ngFor="let prop of getKeys(source)">{{ prop }}: {{ source[prop] | json}}</li>
  </ul>
  </td>
  </tr>
  