Update it_IT.lang

Updated localization for v4.0.5 additions

Need feedback on
-"Travelling Trunk" > "Cassa Fedele" ("Loyal Chest"). "Tronco" sounded unacceptable. "Fedele" could be changed to "Viandante", but I feel loyal represents it better than travelling 
-"Void Jar" > "Barattolo Vacuo" (vacuous jar). tried with "Vuoto"(empty), "del Nulla" (of void) and some other options, but at the moment I feel "Vacuo" represents it better