{% if tabs|length == 1 %} {% include "wagtailadmin/shared/header.html" with title=page_title icon=icon tabbed=0 merged=0 %}
{% include tabs.0.template %}
{% else %} {% include "wagtailadmin/shared/header.html" with title=page_title icon=icon tabbed=1 merged=1 %}
{% for tab in tabs %}
{% include tab.template %}
{% endfor %}
{% endif %}