some time ago we launched the TDE Weblate Translation Workspace - TWTW. The 
first step was integration for translating applications. This seems to be 
successful. 

There impossible to append a new language to an application.

I have tried that for yakuake and tdesvn for Ukrainian and get whether the Gate Timeout or:

Internal Server Error

The server encountered an internal error or misconfiguration and was unable to complete your request.

Regards, Roman