Process for adding to MessagesBundle.properties

I’m in the process of adding new languages to LT. What is the process for adding new languages to the interface do I manually add it to the MessagesBundle.properties files and then only once they part of LT does it go into webtranslateit.com or do I need to request for it to be added there first?

Which language would you like to add? We generally keep UI languages and supported languages for text checking in sync, i.e. we won’t add a UI language that LT doesn’t support for text checking.

I’m trying to add Zulu. Okay thank you.