Zanata
Zanata is a web-based system for translation
... upload their projects to Zanata from maven, command line, and web UI. Currently supported formats are: Gettext PO files, Java Properties, XLIFF, Qt Linguist, Mozilla DTD, JSON.
Documents can be translated as well. Current supported formats are: HTML, subtitles, InDesign Markup Language, Publican DocBook, LibreOffice and plaintext.