Accented characters doesn't work on menu keydown

[bergi9]

jsfiddle.net: ​https://jsfiddle.net/yeuL9b1o/

Using french keyboard or other non-english/non-german keyboards will converted to wrong characters from String.fromCharCode( event.keyCode ); I can't use i.e.: the é to select the correct entry via keyboard.

Maybe using event.key instead of String.fromCharCode(event.keyCode) will works? event.keyCode is deprecated according to MDN.