Hi @Woss, @aki! Sorry that I make you waiting the answer. I googled a bit. As I understand it, those links are called sitelinks. Admins of a site have very little control of how those links are look, even if they appear or not. It is all on Google.
@NicolasChabanovsky Correct, the generation is automatic, but the information displayed is extracted from the site itself. I believe it is necessary to evaluate where he pulls this information and translate it correctly in international communities. Displaying a link to a Portuguese community with English descriptions can be confusing to a user.
I created the question in MSOpt too: https://pt.meta.stackoverflow.com/q/8035/5878 When you have a concrete answer on the subject or an SE position it would be interesting to answer there
You may even contact Google directly; it's probably also in their interest to fix that kind of content
@NicolasChabanovsky But the most critical is the description that is displayed on the main link; even pointing to SOpt the English description is displayed