I assume you already have the esMX and ptBR language packs for your US client, so I won't post those.
Here are file lists for all locales in the EU and CN clients. I don't have koKR or zhTW installed.
On a side note, if you have the disk space, it's pretty easy to just download the whole client. I have them installed for checking language compatibility with my addons, and to keep my globalstrings repo up to date.
Data - EU client, CN client
- alternate.MPQ
- base-Win.MPQ
- expansion1.MPQ
- expansion1.MPQ
- expansion3.MPQ
- expansion4.MPQ
- interface.MPQ
- itemtexture.MPQ
- misc.MPQ
- model.MPQ
- sound.MPQ
- texture.MPQ
- world.MPQ
- wow-update-base-16016.MPQ
- wow-update-base-16048.MPQ
- wow-update-base-16057.MPQ
Data\enGB - EU client
- Documentation (folder)
- AccountBilling (link)
- Credits_CT.html
- expansion1-speech-enGB.MPQ
- expansion2-speech-enGB.MPQ
- expansion3-speech-enGB.MPQ
- expansion4-speech-enGB.MPQ
- locale-enGB.MPQ
- realmlist.wtf
- speech-enGB.MPQ
- TechSupport (link)
- wow-update-enGB-16016.MPQ
- wow-update-enGB-16048.MPQ
- wow-update-enGB-16057.MPQ
Data/deDE - EU client
- expansion1-speech-deDE.MPQ
- expansion2-speech-deDE.MPQ
- expansion3-speech-deDE.MPQ
- expansion4-speech-deDE.MPQ
- locale-deDE.MPQ
- speech-deDE.MPQ
- wow-update-deDE-16016.MPQ
- wow-update-deDE-16048.MPQ
- wow-update-deDE-16057.MPQ
esES, frFR, itIT, ptPT, and ruRU all have the same file list as deDE above.
Data/enCN - CN client (Chinese text with English audio)
- Documentation (folder)
- AccountBilling (link)
- expansion1-speech-enCN.MPQ
- expansion2-speech-enCN.MPQ
- expansion3-speech-enCN.MPQ
- expansion4-speech-enCN.MPQ
- locale-enCN.MPQ
- realmlist.wtf
- speech-enCN.MPQ
- TechSupport (link)
- wow-update-enCN-16016.MPQ
- wow-update-enCN-16048.MPQ
- wow-update-enCN-16057.MPQ
Data/zhCN - CN client (Chinese text with Chinese audio)
Same list of files as enCN.