I think there is no harm in enabling the user interface translatation.
If possible, english is best, but everybody should be able to ask questions in every language he or she is able to speak. Maybe is would be great to have some multilingual users that volunteer to translate in topics, this would even enable community members that are not tech-savy to help out users by enabling others to understand the question.
We could use a topic were people willing to translate post their languages so they can simply be flagged when needed?