Misago/misago/templates/_misago/forums/js.html

<script lang="JavaScript">
$(function() {
  $(".forum-description").each(function() {
    var $forum = $(this).parents('li');
    var $forum_title = $forum.find('.forum-name');

    $forum_title.tooltip({
      container: 'body',
      html: true,
      placement: 'right',
      template: '<div class="tooltip forum-description" role="tooltip"><div class="tooltip-arrow"></div><div class="tooltip-inner"></div></div>',
      title: $(this).html()
    });
  });
});
</script>