NSOpenPanel and NSSavePanel localization

I use non English (Czech) UI of macOS Mojave and XCode 10.0 where I want to use NSOpenPanel and NSSavelPanel in my Swift 4.2 application. Some text items used in panels I can localize via NSOpenPanel/NSSavePanel classes properties but some (like Cancel button for example) I can't. Any suggestin how to localize those? Thanks.