Odd that it would be in chinese, since the dev's here put it in english - it happens though from time to time, Stupid question here, did you reboot? Whenever I have had chinese in the miui rom, once you reboot the english usually returns.
If that doesn't work, you could always try loading Cyanogenmod7. Use the same procedure, but load cm7 from cyanogenmod's site, make sure you load the gapps as well. Or perhaps someone else has a better suggestion?