change tank_name format to new format since XVM r3023

http://code.google.com/p/wot-xvm/source/detail?r=3023
thanks _Kriegstreiber_
http://forum.worldoftanks.eu/index.php?/topic/284919-xvm-tank-minimap-ranges-v17-089/page__st__380__pid__6783127#entry6783127