After applying OSC2CSS those nice "add-to-cart" box that appears has two issues:
1) Easy: window is in English even my language is set to Polish (where can I find strings to modify this window)?
2) no matter what I do when adding something to cart I've got "NULL" information instead of product details. Same happening to shopping cart infobox - but once I go to another page or reload all data in shopping cart are correct.
Any help appreciated :)