This question already has an answer here:
Questions in languages other than English, or which contain non-English text and translated text, have been discussed before on meta.
But what about answers that are written in other languages? How should we deal with them? If someone can translate them, can we keep them? Should we tell people not to post answers that aren't in English? If a non-English answer is translated, should the original text be retained, in case the translation is misleading or incorrect? Should users who have limited English proficiency be told not to post answers in both English and another language? (They might be doing so with the intention that someone more proficient will check their English.)
This question is partly inspired by Bruno Pereira's recent edit and comment to this answer. But it's not limited to that one highly specific scenario. I'm asking a more general question--what is (or should be) our policy, for this entire continuum of situations?