_body_bottom.html.erb

<% if controller_name == 'wiki' && action_name == 'history' -%>
<script>
  (function() {
    var issuePath = '<%= j issue_path(999) %>'.replace(/999$/, '');
    var re = /#(\d+)/;
    var comment;

    $('.wiki-page-version .comments').each(function() {
      comment = $(this).text();
      if (re.test(comment)) {
        $(this).html(comment.replace(re, '<a href="' + issuePath + '$1" title="Open Issue #$1">#$1</a>'));
      }
    });
  })();
</script>
<% end -%>