Hello,

So I restored and deleted everything and starting over again.

I created new language from provided tutorial. It seems to work, but I am not still if after update it won´t disappear.

On 1st screenshot this is my parent theme and on child theme it works.
On second this is child theme and Iimported the translated file. But I guess it´s not how its supposed to be, right?.
I downloaded from here.
https://xtemos.com/glotpress/projects/woodmart/cs/czech/

Should I do something other else so in next updates it won´t disappear?

Thank you.