#
from django.urls import reverse
from django import template
-from django.utils.translation import ugettext as _
+from django.utils.translation import gettext as _
register = template.Library()
tabs.append(Tab('upload', _('Upload'), reverse("documents_upload")))
tabs.append(Tab('cover', _('Covers'), reverse("cover_image_list")))
+ tabs.append(Tab('isbn', 'ISBN', reverse("isbn_list")))
return {"tabs": tabs, "active_tab": active}