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 translations such as:
Pech => Gnomo
Golemancer => Golemante
Thaumium => Taumio
and so on...
Update it_IT.lang

formatted text to fit pages
revised some translations
Update it_IT.lang

changed "minerale di XXX" to "XXX grezzo" to stay with vanilla notation
Merge pull request #165 from FrancescoDeSa/patch-2

Completed italian translation