report success/failure in proctor admin reset form

lms/templates/proctor.html

@@ -40,6 +40,7 @@ $('#proctor_${element_id}_reset_form').submit(function(e) {
     e.preventDefault();
     $('#proctor_${element_id}_submit').attr("disabled", true);
     $('#proctor_${element_id}_submit').html('${_("Processing, please wait...")}');
+    $('#proctor_${element_id}_text').html("");
     $.ajax({
         url: '${ajax_url}/reset',
         type: 'POST',