OK. I did it for you, it took a while but no worries.
Move this file into your World of Warcraft folder. All of the filepaths are set.
The only issue is with "error speech". Blizzard only made error speech like, "I'm too far away", "I can't equip that", in the raspy worgen voice, so those couldn't be replaced. But all the emotes and flirts and whatever else are should be working.
This will change your Worgen Female Voice into an English sounding Gilnean Female Voice.
http://rapidshare.com/files/437020351/Worg2Human.zip
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Also for Syronicus, I did one for you too. This will change your Blood Elf Female Voice into an English sounding Gilnean Female Voice.
http://rapidshare.com/files/437020376/BE2WorgHuman.rar