Note: Fabric API version 0.139.3+1.21.11, which was just released today, is not compatible with Wurst version 7.51.2 MC1.21.11-pre3.
If you use these versions together, all of Wurst's translation strings will disappear, meaning you'll see description.wurst.hack.something instead of the actual hack descriptions (even if your language is set to English).
This will be fixed in the next Wurst Client build (for pre4 or rc1, depending on what Mojang calls it). In the meantime, please use the recommended Fabric API version 0.139.2+1.21.11 instead.