Fix escape in member select2

app/assets/javascripts/members_select_boxes.js

@@ -36,22 +36,22 @@ jQuery(document).ready(function($) {
 
       if (match < 0) {
         return "<span data-value='" + item.id + "'>" +
-               OpenProject.Helpers.markupEscape(item.name) + "</span>";
+               _.escape(item.name) + "</span>";
       }
 
-      markup.push(OpenProject.Helpers.markupEscape(
+      markup.push(_.escape(
                   item.name.substring(0, match)));
       markup.push("<span class='select2-match' data-value='" + item.id + "'>");
-      markup.push(OpenProject.Helpers.markupEscape(
+      markup.push(_.escape(
                   item.name.substring(match, match + tl)));
       markup.push("</span>");
-      markup.push(OpenProject.Helpers.markupEscape(
+      markup.push(_.escape(
                   item.name.substring(match + tl, item.name.length)));
       return markup.join("");
     };
 
     formatItemSelection = function (item) {
-      return OpenProject.Helpers.markupEscape(item.name);
+      return _.escape(item.name);
     };
 
     $("#members_add_form select.select2-select").each(function (ix, elem){