Added a missing {% load bootstrap3 %} in a template.

 - Legacy-Id: 9846

Author: levkowetz

ietf/templates/doc/ballot/clear_ballot.html

@@ -1,6 +1,7 @@
 {% extends "base.html" %}
 {# Copyright The IETF Trust 2015, All Rights Reserved #}
 {% load origin %}
+{% load bootstrap3 %}
 
 {% block title %}Clear ballot for {{ doc }}{% endblock %}