For D:OS there was a third party Brazilian Portuguese localization being done, but it was canceled. I am not sure how complete it is, or if it is still available, if someone else wanted to take over.

https://www.facebook.com/DivinityPT

http://divinitypt.blogspot.pt/2014/11/divinity-original-sin-data-de-lancamento.html

http://divinitypt.blogspot.com.br/2015/02/traducao-de-divinity-original-sin-descontinuada.html