Améliorer l'UX pour la suppression de catégories avec des sujets à l'intérieur

[bloomexperiment (Tracey)]

Just linking another case where an administrator had trouble with the current Delete category behaviour

I'm really convinced that I'm being toyed with by a community software

I can’t find the area to delete “Channels” and when I try to delete a category it tells me “There are channels in this category that can’t be deleted.”