My guess here is that your sound device has a unicode character in its name on the CZ locale computer and this is causing an error as the log file is written (because it refers to the audio device being used)
@hsogo12600 made a fix to this issue here:
https://github.com/psychopy/psychopy/pull/1403/files
so it might be that you can fetch new copies of
- psychopy/sound/init.py
- psychopy/sound/backend_pyo.py
from the repository and replace them in your installed copy
https://github.com/psychopy/psychopy/tree/master/psychopy/sound
These will be included in the next release.
Jon