I may have asked this before. I am an amateur linguist, who has dabbled in every Eastern European language from Finnish in the North to Greek in the South. I am unaware of the St. John Chrysostom Liturgy being translated either into Slovenian or either of the two Wendish/Serbian languages of Germany. It's quite possible that the Serbian church has done a Slovenian translation. I have yet to see it.
I think you may have Sorbian
in mind. No, I'm not aware of any translations.
While not Eastern European, one of my favourite translations is into Anglish: The Worshipform of Hl. Johannes Chrysostomos