product.Category: add verbose_name for 'active' field
product.Category: add verbose_name for 'active' field

Closes #1094.

Reported-by: utku karatas

ringemup/satchmo,ringemup/satchmo,Ryati/satchmo,twidi/satchmo,dokterbob/satchmo,twidi/satchmo,Ryati/satchmo,dokterbob/satchmo