I've just started a brazilian portuguese project available on github https://github.com/orlando2bjr/Pillars-of-Eternity-PT-BR.
It's on a very early stage (11% IU_mod file only).
Just download the mod.zip file and extract it on the localized folder => [Pillars of Eternity installation folder]\PillarsOfEternity_Data\data\localized
Then, choose Português Brasileiro as your language in the Options menu.
Please, let me know if you find any mistakes (send me a screenshot here or tweet to @@orlando2bjr )