As I've played a Draenei female since '07, the fact that her /roar noise sounded like it should go in her /charge bugged me no end. However, I've only just developed the willpower to substitute it for another sound. Similarly, I did the same with the Blood Elf females, and, because Dwarf and Undead females have the same sound (or maybe it's an addon, idk, honestly), I did the same for the Undead as well.
The Draenei females now have a critical attack sound from Soulbinder Nyami, the Blood Elves have one from Alexstrasza, and the Undead females have a regular attack noise from a generic Forsaken NPC. If anyone has any better sounds already in-game they find, go ahead and suggest them and I may make that edit.
To use
Do not install this as a regular addon!
Once you download this, extract it into the base WoW folder. You should get the beginning file structure of World of Warcraft/Sound/character and only then will your game see it as a viable substitution.