pages (merge-requests/edit, tickets/edit, tickets/new): use serialised extra following backend change + fixed use of "update" when editing ticket: "update" was not set in extra, as a result some metadata could be lost on update (author, comments_uri). fix 301

#!/usr/bin/env python2.7
# -*- coding: utf-8 -*-
redirect = u"blog_feed_atom"
name = u"user_blog_feed_atom"