shortcut.js keyboard layout dependent

[esolitos]

Hi, I've noticed that in lib/shortcut.js:56 there's var shift_nums = {} that maps numbers to symbols, those symbols are NOT universal, but only for US keyboard layouts.

ITA Layout:
| ! " £ $ % & / ( ) = ? ^ 
\ 1 2 3 4 5 6 7 8 9 0 ' ì

NO LayoutØ
§ ! " # $ % & / ( ) = ? `
' 1 2 3 4 5 6 7 8 9 0 + ´

I don't think is a huge issue, I wrote this just to let you know.