We are developing a new interface for text chat, to assist conversational partners who don't necessarily speak each others' languages perfectly. It will be especially useful to connect students trying to learn foreign languages with native speakers of that language who are trying to learn the first student's language. The idea is to provide "bad translations" together with tools that let the user quickly analyze the original and translated versions to correct translation mistakes, understand other possibilities for the meaning of a word or phase, provide subject context that helps disambiguate words, provide additional vocabularly in the other language for continuing the conversation, enlist the conversation partner in helping a user learn how to say something, and understand where there may be cultural differences between the speakers. It relies on natural language processing technology together with common-sense knowledge bases in both languages and cultures.