Here is what I did.
Rename this 3 .mpq files. Change the ruRU to shortcut of language you are using. For example i'm using enGB so my files looks like this:
wow-update-enGB-17327.MPQ
If you are using US version just rename it to enUS.
And just one thing. You have to put them in folder of your language, e.g.
*\Data\enGB
Hope this helps ;)