adopt static templatetag to
from django.contrib import admin
from django.contrib import messages
-from django.contrib.admin.templatetags.admin_static import static
from django.forms import widgets
from django.forms.utils import flatatt
+from django.templatetags.static import static
from django.utils.html import format_html
from django.utils.timezone import now
from django.utils.translation import ugettext_lazy as _
