message: Fix icons in navbar component
diff: </li>
  <li>
  <a class="dropdown-item" routerLink="admin/loggers" routerLinkActive="active" (click)="collapseNavbar()">
  - <fa-icon icon="file-alt" [fixedWidth]="true"></fa-icon>
  + <fa-icon icon="tasks" [fixedWidth]="true"></fa-icon>
  <span>Loggers</span>
  </a>
  </li>
  </li>
  <li>
  <a class="dropdown-item" routerLink="admin/logfile" routerLinkActive="active" (click)="collapseNavbar()">
  - <fa-icon icon="tasks" [fixedWidth]="true"></fa-icon>
  + <fa-icon icon="file-alt" [fixedWidth]="true"></fa-icon>
  <span>Logs</span>
  </a>
  </li>
  