Fix side effects with csrf token, add csrf_token to every post form + add ajax (see http://stackoverflow.com/questions/5100539/django-csrf-check-failing-with-an-ajax-post-request), remove django.middleware.csrf.CsrfViewMiddleware ?!
{% extends "email/base_email_notification.txt" %}{% load i18n %}{% block content %}{% blocktrans %}Notification:{% endblocktrans %}
{{ activity.printable_data_nohtml_link }}
({{ activity.printable_metadata_absolute }})
{% endblock %}