Thanks for prompt answer Tobias.
I thought so:-(
I wondered if there was any way to change JavaScripts sorting (Intl.Collator?)…but I realize thats probably impossible to customize code for various languages at once.
I bypassed this by adding another attribute and then order table by this (c,cz etc.).
It is clumsy solutiona bit, but it works:-)
Thanks anyway!
S.