Changes to Russian Tank Tech Tree

Light Tank lvl 3: Change from T-37 to BT-7

Medium Tank lvl 1: Change from BT-7 to T-28 (with following photo

Medium Tank lvl 2: Change from KV-1b to A-32 (with following photo

Heavy Tank lvl 1: Change from KV-2 to KV-1 (with following photo

Heavy Tank lvl 3: Change current photo (which is an IS-2) to following photo (which is an actual IS-3