po: update po/ca/common-base.po (pulled from Transifex.net by CiviCRM l10n maintainer)
po: update po/ca/event.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/pt_BR/event.po (pulled from Transifex.net by CiviCRM l10n maintainer)