We just released the application today and we allowed registrations to the system. Try it yourself! You can find here simple interface for uploading locale files in format of YAML (*.yml) or Gettext (*.po). You can import more than one file at a time, pack in .zip archive.
Application has a lot of functions and tools which can help you with the maintainance of application's locale files. For example, we paste here a screenshot with tree of locale files and folders.