mass update brown_mon -> brown_monster
mass update blue_mon -> blue_monster
mass update 0mon -> 0_monsters
mass update 1mon -> 1_monster
mass update 2mons -> 2_monsters
mass update 3mons -> 3-4_monsters
mass update 4mons -> 3-4_monsters
mass update 5mons -> 5-9_monsters
mass update 6+mons -> 5-9_monsters