Add volume description and warning text

src/views/app.html

@@ -737,6 +737,8 @@
 
         <div class="form-group mounts">
           <label class="control-label">{{ 'app.storage.mounts.title' | tr }} <sup><a ng-href="https://docs.cloudron.io/apps/#volumes" class="help" target="_blank"><i class="fa fa-question-circle"></i></a></sup></label>
+          <p ng-bind-html="'app.storage.mounts.description' | tr"></p>
+          <p class="text-warning text-bold" ng-bind-html="'app.storage.mounts.warning' | tr"></p>
           <div class="has-error" ng-show="storage.error.mounts">{{ storage.error.mounts }}</div>
 
           <table class="table table-hover" style="margin-top: 10px;" ng-show="storage.mounts.length > 0">