Fix appearance of messages in Studio

problem_builder/message.py

@@ -67,7 +67,10 @@ class MentoringMessageBlock(XBlock, StudioEditableXBlockMixin):
 
     def mentoring_view(self, context=None):
         """ Render this message for use by a mentoring block. """
-        html = u'<div class="message {msg_type}">{content}</div>'.format(msg_type=self.type, content=self.content)
+        html = u'<div class="submission-message {msg_type}">{content}</div>'.format(
+            msg_type=self.type,
+            content=self.content
+        )
         return Fragment(html)
 
     def student_view(self, context=None):

problem_builder/public/js/mentoring_edit.js

@@ -5,7 +5,7 @@ function MentoringEditComponents(runtime, element) {
     var updateButtons = function() {
         $buttons.each(function() {
             var msg_type = $(this).data('boilerplate');
-            $(this).toggleClass('disabled', $('.xblock .message.'+msg_type).length > 0);
+            $(this).toggleClass('disabled', $('.xblock .submission-message.'+msg_type).length > 0);
         });
     };
     updateButtons();