KamAz 4310 special! HU, IT, PT, RU additions. Minor corrections Multi.

"KamAZ" is the manufacturer, while 4310 is the model. 
IMHO, we should rename it "4310" whatever how weird it may feel, as you did with the Otokar "Arma", for accuracy's sake.

Here is the version with 4310 instead of KamAZ, your call then.

Contains all changes from #1052