I think it was GU 51 or GU 52 where the english names of spells/abilities stopped working for international users. Instead of trying to keep up with all the different spellings of the names of the spells (which seemed to change randomly on german servers) UI developers decided to go to the spell number which is universal.
Somewhere on this site, you will find a posting of people coorelating spell names to numbers. One fine user actually made a list. Its early here and I didnt have coffee yet, so I have not tried looking for it... However, its here somewhere... search is your friend.
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