Fixed #10997: fixed a Python 2.4-ism in admin actions.

from django.utils.safestring import mark_safe

from django.utils.text import capfirst

from django.utils.translation import ugettext_lazy, ugettext as _

try:

    set

except NameError:

    from sets import Set as set     # Python 2.3 fallback

def delete_selected(modeladmin, request, queryset):

    """