How can I contribute in translation of pt-BR?

I made the translation for PT-br and for each new plugin update I need to upload .mo e .po files under lang dir.

Below are links to the translated into Portuguese of Brazil files.

http://unilogica.com/wp-content/plugins/dw-question-answer/languages​​/dwqa-pt_BR.mo
http://unilogica.com/wp-content/plugins/dw-question-answer/languages​​/dwqa-pt_BR.po
If you want to add to the oficial repository or revise my translation feel yourself comfortable to copy redistribute this files.