In this paper, we present the Cross-Lingual Wiki Engine (CLWE), a system designed to support concurrent, collabo- rative authoring and translation of content in multiple lan- guages. We start by showing how collaborative translation diers from conventional translation environments. In par- ticular, we show how conventional industrial translation pro- cesses and tools are based on assumptions that often do not hold in collaborative environments. We then provide a de- tailed storyboard which shows how the CLWE can be used by groups of users, to collaboratively author and translate content without having to make those assumptions. We then discuss the implementation of the CLWE's change tracking infrastructure, which turns out to be the critical compo- nent in enabling this sort of open-ended translation work- ow. We show how the problem of tracking changes in mul- tiple languages at once can be greatly simplied using ab- stract change tokens which are independent of language and textual content. The system has been deployed in several communities, including SUMO (the Firefox documentation site), and preliminary feedback is encouraging.