models.py

    class Meta(object):
        unique_together = (('parent', 'locale'), ('slug', 'locale'))
        permissions = (
            ("view_document", "Can view document"),
            ("add_template_document", "Can add Template:* document"),
            ("change_template_document", "Can change Template:* document"),
            ("move_tree", "Can move a tree of documents"),
            ("purge_document", "Can permanently delete document"),
            ("restore_document", "Can restore deleted document"),
        )