Hi Mike,
The Czech translations should occur if you (tomorrow) install a Debian or Ubuntu system, and then install X2Go Server from the nightly repository (aka heuler).
Thanks. Unfortunately I'm kind of dumb I think. As I never used Debian based distros I didn't find out how to access the debconf translated strings. Even after asking uncle google for some tips and testing around. Would you mind to give me some hints please? What I have now is a fresh install of Debian 9.3 with x2goserver installed from heuler based on the instructions at https://wiki.x2go.org/doku.php/wiki:repositories:debian Btw. I wasn't able to install x2goserver on a freshly installed Ubuntu 18.04 from heuler. It failed with some missing dependency. Unfortunately I didn't copy the message before I dropped the VM... Thanks -- Tom Ruzicka
Czech translation now added to X2Go Server (X2Go upstream and Debian downstream (upload still pending)).