HU, IT, PT, RU additions. Minor corrections v2.

Added Hungarian, Portuguese, Italian entries so they at least have the realistic-ish names and Russian folks have the names wrote in Cyrillic, as far as I have been able to find them on Wiki.

Please note that I'm not fluent in these language, I just assume that's at least more enjoyable than plain English.
Minor corrections to harmonize other languages.

* M2A1 Slammer looks to be a Merkava Mk 4m Windbreakern which is "a Merkava Mk IV equipped with the Trophy active protection system (APS)".
http://en.wikipedia.org/wiki/Merkava#Mk_IVm_Windbreaker
As for Arabic numeral vs roman, well, I simply took a look at the Hebrew wikipedia.

Hopefully, Spanish entries should now be  #632 compliant, thanks to esteldunedain.

Please see #1056