themes/prose: add .box-name support
themes/prose: add .box-name support

boliusandreas/oh-my-zsh,boliusandreas/oh-my-zsh,offbyone/oh-my-zsh,arnuschky/oh-my-zsh,WPettersson/oh-my-zsh,lesterchan/oh-my-zsh,arnuschky/oh-my-zsh,boliusandreas/oh-my-zsh,pocketkk/oh-my-zsh,pocketkk/oh-my-zsh,offbyone/oh-my-zsh,lesterchan/oh-my-zsh,arnuschky/oh-my-zsh,offbyone/oh-my-zsh,WPettersson/oh-my-zsh,arnuschky/oh-my-zsh