In which language should the questions be posted? Portuguese or English?
If a question is posted in a language different from the expected, what should we do? Flag to close or translate and edit?
I think all contributions (questions, answers and comments) should be allowed in portuguese and/or english.
In the case of a question or an answer, you can always edit it to add a translation. In the case of a comment you can not edit to translate it, but the comments that add value to a question or to an answer could be included in such question or answer, using both languages if appropriate.