As workshop_2015 noted about translation , I find a good language translate tool as https://crowdin.com/. Google account can have a 10 day demo but OSS project is free .
It totally supports id's xml file import and export , not need a .po interaction.
Features like branch support , good UI , machine translation , keyboard shortcut , customizable workflow , team collaboration and API etc are better than other providers followed:
Hope this topic is useful for id's Localization work and Any more feedbacks are welcome .