[1.8.x] Refs #24836 -- Reverted "Simplified the lazy CSRF token implementation in csrf context processor."

This reverts commit 8099d33b65 as it caused
a regression that cannot be solved without changing force_text() which has
a small risk of introducing regressions. This change will remain in master
along with an update to force_text().

django/template/context_processors.py

@@ -11,8 +11,9 @@ from __future__ import unicode_literals
 
 from django.conf import settings
 from django.middleware.csrf import get_token
+from django.utils import six
 from django.utils.encoding import smart_text
-from django.utils.functional import SimpleLazyObject, lazy
+from django.utils.functional import lazy
 
 
 def csrf(request):
@@ -29,8 +30,9 @@ def csrf(request):
             return 'NOTPROVIDED'
         else:
             return smart_text(token)
+    _get_val = lazy(_get_val, six.text_type)
 
-    return {'csrf_token': SimpleLazyObject(_get_val)}
+    return {'csrf_token': _get_val()}
 
 
 def debug(request):