A good alternative to this that I have used is myGengo's free localization tool, String (http://mygengo.com/string/). It allows you to upload various types of lang files, and collaborate with translators working in multiple languages from a simple UI. You can also create public projects so community members can view and request access. Codeligniter, amongst several others, have done this to translate their language packs(http://mygengo.com/string/public_projects)