{% extends "admin/login.html" %}
{% load i18n %}
{% load url from future %}
{% block content %}
{{block.super}}
<a href="{% url 'admin:admin_sso_assignment_start' %}">{% trans "Log in using SSO" %}</a>
{% endblock content %}

{% extends "admin/login.html" %}

{% load i18n %}

{% block content %}
{{ block.super }}
<a href="{% url 'admin:admin_sso_assignment_start' %}">{% trans "Log in using SSO" %}</a>
{% endblock content %}

Remove "load url from future" -- with a minimum Django version of 1.7 not required anyway
Remove "load url from future" -- with a minimum Django version of 1.7 not required anyway
