BUR #42524 has been approved by @Hillside_Moose.
category death_devil -> general
rename death_devil -> death_devil_(k-on!)
deprecate death_devil
Death Devil is the name of Yamanaka Sawako's old band when she was still a student at Sakuragaoka High. Changing the tag's category to general to match the other K-On! band tags and adding the copyright qualifier to it because there is already a character named Death Devil from Chainsaw Man.