Or you could download the program called WoW!Translator.
It uses WoWsharp, but doesnt not cost money like the WoW!Bot does.
Currently works like a charm, and, btw, the words are not randomly generated.
It is pretty much decided that depending on the character used and it's place in the sentence, it will change accordingly.
If you want to test it for yourself, meet with someone on the other faction and type, AAAAAAAA, BBBBBBBB, CCCCCCC.
If you don't want to waste your time like that, again, WoW!Translator translates everything, I have used it for weeks now and it works like a charm.
I have much fun with it actually

for example, horde see alliance saying you as "bur".
The other day someone said, "Go bur your mother" and I simply replied, "YOU YOU YOU YOU YOU YOU" which they saw as "BUR BUR BUR BUR BUR"
Then another person said, "You think he understood" haha. Good times
Take care