missing line to SU-76 fixed, added premium tanks

- missing line to T-50 and SU-76 fixed
- premium tanks added:
china: type 62, Type 59
usa: T1E6, M6A2E1, M60, T95E6
germany: Pz.Kpfw. 38H 735 (f), Pz.Kpfw. II Ausf. J, Großtraktor - Krupp,
Pz.Kpfw. B2 740 (f), Pz.Kpfw. V/IV, Pz.Kpfw. V/IV Alpha, VK 72.01 (K)
ussr: BT-SV, M3 Light, A-32, KV-220, KV-220 Beta-test ussr

Missing in db /maybe never available/:
china:
Tier 8 WZ-111 -premium heavy tank
http://wiki.worldoftanks.com/WZ-111
japan:
Tier 3 Type 98 Ke-Ni Otsu - premium light tank
http://worldoftanks.com/encyclopedia/vehicles/japan/ke_ni_b/
usa:
Tier 3 MTLS-1G14 - premium light tank
http://wiki.worldoftanks.com/MTLS-1G14
ussr:
Tier 5 SU-85I - premium tank destroyer
http://wiki.worldoftanks.com/SU-85I