Translation

I have added this module on my registration page: http://www.forniture-alberghiere.net/en/user/register
but I need to translate it and rewrite it for users, because the rules was initially written for administrator and not for public-marketing use.
The strings needing to be translated are:

Select one role.
=
Seleziona un ruolo.
---------
-- select role --
=
- seleziona un ruolo --
---------
Role
=
Ruolo
------
and be able to translate all roles and be ale to rewrite the original version.