There are plenty of older Polish people living in countries like Belgium who are born in a city that's can be translated to "Blue". How comes? For the color of

There are plenty of older Polish people living in countries like Belgium who are born in a city that's can be translated to "Blue". How comes? For the color of the eyes used to be present on Polish ID cards / official documents (maybe still is, dunno). And a great many people in non-polish speaking countries read the wrong line for "place of birth".