Transifex.com, A way to make translating simple for non-technical people (:
Here is a fearture for auto-syncing between Github and Transifex:https://github.com/jsilland/txgh
, Txgh is an Open Source Sinatra server created by Strava. It uses Webhooks to automatically trigger updates in GitHub and Transifex. If a developer commits a change to a source translation file in GitHub, txgh automatically updates the file in Transifex. Additionally, if a translator makes a change in Transifex that updates a file to 100%, txgh creates and pushes a new commit to GitHub. Txgh removes the added step of having to run the Transifex Client each time a translation is added.
Also there's a client for Transifex to work with git: http://docs.transifex.com/client/
Read more: https://www.transifex.com/blog/2015/how-to-use-git-to-track-changes-in-translation-files/