Hello.
I'm here to report some problems I spot on the brazilian portuguese.
On the PNG saving options dialog, there are two problems:
The header says "Configuração para salvamento". Salvamento sounds like someone is drowning or in a building on fire. I think the best translation would be "Configuração para salvar".
Then one of the options is "Detectar Automáticamente". Correct would be "Detectar automaticamente", without the "á".
Keep it up.