adiciona imports faltando

sapl/norma/urls.py

@@ -1,7 +1,7 @@
 from django.conf.urls import include, url
 
 from sapl.norma.views import (AssuntoNormaCrud, NormaCrud, NormaPesquisaView,
-                              TipoNormaCrud)
+                              TipoNormaCrud, NormaTaView)
 
 from .apps import AppConfig
 

sapl/norma/views.py

@@ -2,6 +2,7 @@ from datetime import datetime
 
 from django.core.urlresolvers import reverse
 from django.shortcuts import redirect
+from django.utils.translation import ugettext_lazy as _
 from django.views.generic import FormView, ListView
 from django.views.generic.base import RedirectView
 from django_filters.views import FilterView