horizon/horizon/templates/horizon/common/_domain_page_header.html

{% load i18n %}
{% block page_header %}
  <div class='page-header'>
    <h2>
    {% if request.session.domain_context_name %}
      <em>{{ request.session.domain_context_name }}:</em>
    {% endif %}
    {{ title }}
    </h2>
  </div>
{% endblock %}