Issue #2031 An admin can't set another user as an admin/webmaster. UIX

admin/themes/default/template/user_list.tpl

@@ -98,6 +98,10 @@ $(".icon-help-circled").tipTip({
 });
 
 $(document).ready(function() {
+  // Only webmaster can set admin or webmaster to others users
+  if (connected_user_status !== 'webmaster') {
+    $('select[name="status"] option[value="webmaster"], select[name="status"] option[value="admin"]').attr("disabled", true);
+  }
   // We set the applyAction btn click event here so plugins can add cases to the list 
   // which is not possible if this JS part is in a JS file
   // see #1571 on Github