PICARD-631: honour preferred release formats when matching AcoustIds

`format` wasn't copied to rebuild xml node during acoustid matching
Merge pull request #354 from zas/PICARD-631

PICARD-631: honour preferred release formats when matching AcoustIds
Update pot file
Update MB_ATTRIBUTES: CDV format added

Updated using `python setup.py update_constants`
Update .po files
Update po files
Update .po files
Update links to use new Picard website (http://picard.musicbrainz.org)
Display main libs versions in debug log

We were already displaying pyqt, mutagen and discid versions in About dialog, now they'll be shown in debug log too.
It will help with debug logs provided by users.
Merge pull request #357 from zas/versions

Display main libs versions in debug log
Merge pull request #356 from zas/new_links

Update links to use new Picard website (http://picard.musicbrainz.org)
Update picard.pot
Sync translations