Incomplete translations?

Hello, I think there is something broken about translations. The webUI offers to switch to 20 different languages. But I see that in /opt/zextras/web/iris/*/i18n/ there are json files for 30 languages. How do I enable them? If the translation (cs.json) is not complete, I can work on it, but I need to have a way to try it out even if it is not complete.

Also the repo at https://github.com/zextras/carbonio-webui-i18n/ does not contain any json files, not even a template so potential translators do not know what to translate. And the link: https://zextras.com/carbonio-ce-contribute/ redirects to https://zextras.com/

Is there anyone who cares about translations and willing to accept community contibuted translations?

Best regards

Vladki