docs: def get_title(self, group=None):
          """Adds number of comments to title."""
          title = super(CommentsPlugin, self).get_title()
          if group is not None:
              count = GroupComments.objects.filter(group=group).count()
          else:
              count = None
          if count:
              title = u'%s (%d)' % (title, count)
          return title