Fix random frontend (problem info, lazy load img, comment pagedown)

templates/comments/media-js.html

@@ -211,10 +211,10 @@
       $comments.find('a.edit-link').featherlight({
         afterOpen: function () {
           register_dmmd_preview($('#id-edit-comment-body-preview'));
+          register_markdown_editors();
           if ('DjangoPagedown' in window) {
             var $wmd = $('.featherlight .wmd-wrapper');
             if ($wmd.length) {
-              window.DjangoPagedown.createEditor($wmd.get(0));
               if ('MathJax' in window) {
                 var preview = $('.featherlight div.wmd-preview')[0];
                 renderKatex(preview);