Fix backup error message width

src/views/app.html

@@ -1244,10 +1244,10 @@
             <br/>
 
             <div class="row">
-              <div class="col-md-6">
+              <div class="col-md-8">
                 <p class="has-error" ng-show="backups.error.message">{{ backups.error.message }}</p>
               </div>
-              <div class="col-md-6 text-right">
+              <div class="col-md-4">
                 <button type="button" class="btn btn-primary pull-right" ng-click="backups.createBackup()" ng-disabled="app.taskId || backups.busyCreate || app.error || app.runState === 'stopped'" tooltip-enable="app.error || app.taskId || app.runState === 'stopped'" uib-tooltip="{{ app.error ? 'App is in error state' : 'App is not running' }}">
                   <i class="fa fa-circle-notch fa-spin" ng-show="app.installationState === 'pending_backup' || backups.busyCreate"></i> {{ 'app.backups.backups.createBackupAction' | tr }}
                 </button>