[1.6.x] Fix typo CRSF -> CSRF
[1.6.x] Fix typo CRSF -> CSRF

Backport of af64f829d7 from master

dex4er/django,redhat-openstack/django,redhat-openstack/django,django-nonrel/django,dex4er/django,redhat-openstack/django,dex4er/django,felixjimenez/django,felixjimenez/django,django-nonrel/django,felixjimenez/django,django-nonrel/django,felixjimenez/django,redhat-openstack/django,django-nonrel/django