I'm using Linux, Pop OS. If I change the keyboard layout to Russian, Ukrainian or Japanese, the confirm dialogue doesn't work.

This can be fixed by checking for a physical key, rather than a literal character. But as far as I've researched this is not a trivial thing to do. I'm not sure how to approach this issue with all the different languages and layouts in mind.

There is also a band aid solution. Just check against multiple characters from different languages.