po: update po/de/common-base.po (pulled from Transifex.net by CiviCRM l10n maintainer)
po: update po/de/event.po (pulled from Transifex.net by CiviCRM l10n maintainer)
po: update po/hu/common-base.po (pulled from Transifex.net by CiviCRM l10n maintainer)
po: update po/pl/contribute.po (pulled from Transifex.net by CiviCRM l10n maintainer)
po: update po/uk/mailing.po (pulled from Transifex.net by CiviCRM l10n maintainer)