Use option name instead of slug as field label
Use option name instead of slug as field label

When building the AddToBasketForm for a product with options, Oscar
didn't specify a label for the form field. Hence the field name was
used, which is the rather human-unfriendly slug. Options have a name
field, so we can just use that.

sonofatailor/django-oscar,sasha0/django-oscar,sonofatailor/django-oscar,django-oscar/django-oscar,sonofatailor/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,django-oscar/django-oscar,sasha0/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,solarissmoke/django-oscar,sasha0/django-oscar,solarissmoke/django-oscar,sonofatailor/django-oscar,sasha0/django-oscar