[validation api] properly use yams 0.36 validation error api and update message catalog. Follows bbe0d6985e59
the creation of the `translate` method in the 23a10f049447 yams commit.
# -*- coding: utf-8 -*-
# copyright %(year)s %(author)s, all rights reserved.
# contact %(author-web-site)s -- mailto:%(author-email)s
#
%(long-license)s
"""%(distname)s specific hooks and operations"""