Completed italian translation

The base translation is done. Now it needs some revisions for typos and inconsistences (for example the use of different names for the same thing over the document).

Apreciated feedback/discussions over some arbitrary transpositions such as:
Pech => Gnomo
Golemancer => Golemante
Thaumium => Taumio
and so on...

Also need to check the lenght of text on each page and eventually adapt it