Extract all three .big files into your HW2's data folder, then create a shortcut of the game with command line:" -mod yaodumod.big,yaodumodpatch.big,yaodumoden.big" and enjoy!
This have not been fully tested yet, so any BUG report would be appreciated.
The biggest problem may be the length of strings. Most English words are longer then Chinese, so if you don't have a big enough monitor, there could be many strings out of range.
Another problem is the UI items, they are not translated because they are all pictures, so you might just have to try them out, sorry...
Create a new profile to play the trading mode(access by clicking the second button on the main menu).