Are you sick of WH3 UI sounds because they sounds like they were designed, mixed, and mastered by Nurgle? Are you sick of the sub-bass wannabe cool sounds that sound like the main audio guy bought a brand new pair of new cans and wanted to really enjoy them?
A redditor calling himself MaximumGibbous described with as follows and I couldn't agree more:
"WH3 UI effects seem like a horrible cacophony of mud slaps, squelches and farts for me. Changing them would be amazing."

Well, here it is. WH1 and WH2 UI sounds mod.
I honestly didn't test WH3 races very much as I don't care about them so I'm not sure what they sound like. But I don't expect anything too jarring.

After finishing this, I've found out that some sounds (such as opening the Intrigue panel when playing as High Elves) are very quiet. I'm planning on adding them in future updates.

Better Sound Levels Mod v5.4 - since you probably care about audio, I strongly recommend you to get this mod as well. It makes the world of Warhammer much more immersive

Audiokinetic Inc. - for providing me with Wwise non-commercial license
Pear - for guiding me through the process of putting new soundbanks into the game
Ole - for active development of Asset Editor Audio Explorer
Makers of wwiser, vgmstream, and foobar2000.
Groove Wizard - making LUA console that made sound testing much easier
prop joe - for creating the amazing mod manager and the dev console, making play-testing much easier