In patch 4.32 all the wow client of different regions will be merged into one.
If you want to change US client into Chinese one,just create a folder named zhCN under Data.
Run Laucher.exe,and in Game Preference you will find Simplified Chinese on the list,laucher then will download the rest content.
There will be some MPQ files especially for chinese,they will be downloaded or loaded when you choose Simplified Chinese.
So,verification process will be alot easy as they are all based on the same Laucher.exe and wow.exe.
Or maybe we don't need to be upset about any patch again.Just modify realmlist.wtf and you can play on chinese service with the Enligh language displayed