Updated it_IT.lang thanks to TheVikingWarrior

Same note as in ru_RU.lang Pull request.

If you want this update, accept the PR;

I got the file from http://www.minecraftforum.net/topic/1680480-16215xforgesmp-bibliocraft-v140-bookcases-armor-stands-shelves-printing-presses-lamps-tables-and-more-updated-08172013/page__st__1660#entry23992208