Glad to hear you got the 403 forbidden thing fixed. Please note that it may take up to a week for LinkedIn to re-scan your pages and properly fetch the right data. Until then, you still may see 403 as the description when sharing some content.
As for the language, I'm actually a bit surprised. Usually, LinkedIn is very English-centric, so it's unusual that it's using Brazilian. My guess is that it's detecting that you're logged into LinkedIn already and using your profile information. Is Brazilian your default language on LinkedIn? Can you try from a different LinkedIn account and see what happens?
JFBConnect doesn't currently set the language for LinkedIn's social buttons. It's something we have planned for the future as we already set it properly for Facebook and want to do the same, where we can, for the other networks.
I hope that helps,
Alex