Add lang for generic collar

Author: Ampflower

xplat/src/main/resources/assets/petworks/lang/en_us.json

@@ -2,6 +2,7 @@
 	"block.petworks.maid_collar": "Maid Collar",
 	"block.petworks.missing_collar": "Missing Collar",
 	"block.petworks.cloth_collar": "Cloth Collar",
+	"block.petworks.collar": "Collar",
 
 	"block.petworks.pride_collar": "Pride Collar",
 	"block.petworks.trans_collar": "Trans Collar",