Show backend error if remote SSH cannot be enabled

src/views/support.html

@@ -78,6 +78,7 @@
             <b>{{ 'support.remoteSupport.warning' | tr }}</b>
             <br/>
             <br/>
+            <b class="pull-left text-danger text-bold" ng-show="toggleSshSupportError">{{ toggleSshSupportError }}</b>
             <button class="btn" ng-class="!sshSupportEnabled ? 'btn-danger pull-right' : 'btn-primary pull-right'" ng-click="toggleSshSupport()">{{ sshSupportEnabled ? ('support.remoteSupport.disableAction' | tr) : ('support.remoteSupport.enableAction' | tr) }}</button>
           </div>
         </div>