It's also, unfortunately, part of one of the player voicesets. As has been discussed previously in the Forums, replacing a voiceset is an annoying process that requires a number of client-side alterations (more downloads, in other words), and would require that a suitable voiceset is produced to replace it.
While someone on the Team might think it's worth replacing, the advice I'd give at this point is "just ignore it". It's part of the NWN system, which, by its nature, is fairly inextricably linked to the Forgotten Realms.