l10n: Updated Portuguese (Brazilian) (pt_BR) translation to 100%

New status: 44 messages complete with 0 fuzzies and 0 untranslated.

Transmitted-via: Transifex (translations.xfce.org).
l10n: Updated Polish (pl) translation to 100%

New status: 44 messages complete with 0 fuzzies and 0 untranslated.

Transmitted-via: Transifex (translations.xfce.org).