Chord Translation and 'Em' should be 'Easy'

Hi,
I made a small patch that allows to translate chords from english to italian (but should be easy to extend).

Please integrate it, it just add a new '-I' switch for the translation to occur.

Moreover I patched (in another commit) some chord definitions, since documentation states that basic chord forms should be marked as "Easy" and "Em" is for sure not HARD.

Thanks!