It contain the swaps:
Edge of Ruin -> Shadowmourne
Grand Marshal Sunderer & Battle Hammer -> Grand Marshal Claymore.
Grand Marshal Left Hand Blade & Right Hand Blade -> Abomination Knuckles
Grand Marshal Handaxe & Punisher -> Grand Marshal Longsword.
It's a a few swaps that I have made. If you have any requests, do not hesitate to PM me or leave a message here and I will fix it asap!
itemcache.wdb
To apply the changes, save the itemcache.wdb in your World of Warcraft/Cache/WDB/EnGB or EnUS/ and overwrite the current itemcache.