Updated translations

Commands run:-
$ python setup.py extract_messages
$ python setup.py update_catalog --no-fuzzy-matching \
  --ignore-obsolete=true
$ source \
  ../openstack-infra/project-config/jenkins/scripts/common_translation_update.sh
$ setup_loglevel_vars
$ cleanup_po_file nova

Change-Id: I64b2b468f7edd44dbb445b5b4e68b65c3fa53d9e
Merge "Updated translations" into proposed/juno