That said, we do allow our users to post translations of non-English content, while leaving the untranslated versions accessible - you may view an example here: https://www.zidisha.org/microfinance/loan/SALIMATA2/9512.htm.... We also sometimes edit the titles of loan projects for clarity.
It'd be good to connect with you sometime on sharing knowledge on the tools used for allowing for user-based translations. I'm not sure if you saw the tools we use at Kiva, but I imagine there's some overlap where we could probably work together to create a more generic tool focused on translating loan descriptions that would work for both of us and other micro-finance organizations out there. There's some decent open-source stuff out there but nothing that's worked for us without heavy customization.