The addon community has graciously given us many fixes for the mature language filter bug, but the one I've been using is called Mature Language Filter Fix. You can grab it on Curse, slap it into your Interface directory in your WoW folder, and ta-da, no more mature language filter. Tell them how you really feel, every time, with this fix. There's also Force Mature Language Filter, which does the exact same thing. Two choices!
Download Mature Language Filter Fix at [Curse].
Download ForceMatureLanguageFilter at [WowAce].
Don't forget to tune in to Addon Spotlight every Thursday on WoW Insider.
*The Ice Stone has melted!
Addons are what we do on Addon Spotlight. If you're new to mods, Addons 101 will walk you through the basics; see what other players are doing at Reader UI of the Week. If there's a mod you think Addon Spotlight should take a look at, email firstname.lastname@example.org.