If you haven't already, check out the
Open Graph Action Internationalization Guide
from Facebook. I've never gone through the full process of translating for multiple languages. It seems like you may want to add the following tag to the 'Defaults' area in JFBConnect -> Open Graph -> Configuration:
Then, there are multiple ways to translate from English to Portuguese so that the data shows up in both.
If your app is only in Portuguese though, I don't think you need to do as much. You mainly just need to create the text in your Action and Objects for singular/plural nouns, etc to be in Portuguese by default. Then, there's no translation, it just works.
I'm definitely sending you off to do a little research, because I don't know the answer directly. Hopefully that puts you on the right track though.
Thanks,
Alex
Open Graph Internationalization
