<div class="left-sidebar">
  {{ make_tab_item('list', 'fa fa-list', url('contest_list'), _('List')) }}
  {{ make_tab_item('calendar', 'fa fa-calendar', url('contest_calendar', now.year, now.month), _('Calendar')) }}
  {{ make_tab_item('admin', 'fa fa-edit', url('admin:judge_contest_changelist'), _('Admin')) }}
</div>