Show warning message for rTorrent that it doesn't support torrent removal

src/UI/Form/FormBuilder.js

@@ -1,6 +1,7 @@
 var Marionette = require('marionette');
 var Handlebars = require('handlebars');
 var _ = require('underscore');
+require('./FormMessage');
 
 var _templateRenderer = function(templateName) {
     var templateFunction = Marionette.TemplateCache.get(templateName);

src/UI/Form/FormMessage.js

@@ -0,0 +1,17 @@
+var Handlebars = require('handlebars');
+
+Handlebars.registerHelper('formMessage', function(message) {
+    if (!message) {
+        return '';
+    }
+
+    var level = message.type;
+
+    if (message.type === 'error') {
+        level = 'danger';
+    }
+
+    var messageHtml = '<div class="alert alert-{0}" role="alert">{1}</div>'.format(level, message.message);
+
+    return new Handlebars.SafeString(messageHtml);
+});

src/UI/Settings/DownloadClient/Edit/DownloadClientEditViewTemplate.hbs

@@ -8,6 +8,8 @@
         {{/if}}
     </div>
     <div class="modal-body download-client-modal">
+        {{formMessage message}}
+
         <div class="form-horizontal">
             <div class="form-group">
                 <label class="col-sm-3 control-label">Name</label>