Okay guys, I was looking for it for a VERY long time, but I never managed to find any solution.
And today is the day. 5 minutes were enough for me to think carefully and to finally find out how to play US/EN/FR/DE WoW with ORIGINAL FONTS...AND TO BE ABLE TO SEE CHINESE CHARACTERS !
So for anybody who's tired of ARIAL NARROW and other BASIC caracters, here is the key
So...For this you'll need :

A CWoW client.
A USWoW client (or any client of your choice).
WoW MPQ Extractor (I use Ladik's MPQ Editor)
And that's all

1.So, go to your cWoW folder, then "Data" Subfolder. In Data Subfolder you should have "enCN" and "zhCN" subfolder. Go to "zhCN".

2.In "zhCN" subfolder you can find different files. You will need MPQ editor to be able to explore those files. Open "locale-zhCN" with your MPQ editor.

3.In locale-zhCN folder, you'll find a "Fonts" folder. Extract it on your desktop (for example).

4.Then copy the 3 "ZY" files (ZYKai_C, ZYKai_T, and ZYhei). Paste them in your usWoW "Fonts" folder (the one you are using to see chinese caracters in game). Don't forget to back up your old usWoW Fonts folder, in case you missed a step or whatever.

5.Rename ZYKai_C into "SKURRI.ttf", ZYKai_T into "ARIALN.ttf" and ZYhei into "FRIZQT__.ttf" (you'll have to replace the old files, that's why you need to back them up, just in case).

6.Try to launch the game, you should now see chinese fonts AS THEY APPEAR IN CWOW. That's it, no more boring Arial Narrow Fonts


And a little preview :

BEFORE :





AFTER :




(My chat window fonts are set to small but you can make them bigger by right clicking on chat window-> font size)

HERE YOU ARE GUYS