Polish letters in Unreal Engine 4

Hi,

How can I get Polish letters (e.g. “ś”, “ć”) in UE4?

OK, I managed to get Polish letters in UE4, but I’ve got a problem with letter “ó”. In strings instead of that letter UE4 shows “?”. But, when I put some other Polish letter (like “ś” for example) after “ó”, “ó” shows normally. I have no idea why is that.