{% load creme_widgets %}
{% if button.permission_error %}
<span class="menu_button menu-button-icon forbidden" title="{{button.permission_error}}">
    {% widget_icon name='contact' size='instance-button' label=_('Linked contact') %}
    {{button.verbose_name}}
</span>
{% else %}
<a class="menu_button menu-button-icon" title="{{button.description}}" data-action="redirect"
   href="{% url 'persons__create_related_contact' object.id %}?callback_url=${location}">
    {% widget_icon name='contact' size='instance-button' label=_('Linked contact') %}
    {{button.verbose_name}}
</a>
{% endif %}