handle django3.2 using fancy quotes; enable devhub job for 3.2 (#16469)

* handle django3.2 using fancy quotes; enable devhub job for 3.2

* directly test django version for fancy quotes

.circleci/config.yml

@@ -674,7 +674,7 @@ workflows:
             parameters:
               djangoversion:
                 - django22
-#                - django32 # django3.2 tests still failing
+                - django32
       - docs
       - main:
           matrix:

src/olympia/devhub/tests/test_views_submit.py

@@ -9,6 +9,7 @@ import zipfile
 from datetime import datetime, timedelta
 from urllib.parse import urlencode
 
+import django
 from django.conf import settings
 from django.core.files import temp
 from django.core.files.storage import default_storage as storage
@@ -43,6 +44,12 @@ from olympia.versions.models import License, VersionPreview
 from olympia.zadmin.models import Config, set_config
 
 
+IS_DJANGO_32 = django.VERSION[0] == 3
+# django3.2 uses fancy double quotes in its error strings
+STRING_QUOTE_OPEN = '“' if IS_DJANGO_32 else "'"
+STRING_QUOTE_CLOSE = '”' if IS_DJANGO_32 else "'"
+
+
 def get_addon_count(name):
     """Return the number of addons with the given name."""
     return Addon.unfiltered.filter(name__localized_string=name).count()
@@ -1034,8 +1041,8 @@ class DetailsPageMixin(object):
             response,
             'form',
             'slug',
-            "Enter a valid 'slug'" + ' consisting of letters, numbers, underscores or '
-            'hyphens.',
+            f'Enter a valid {STRING_QUOTE_OPEN}slug{STRING_QUOTE_CLOSE} consisting of '
+            'letters, numbers, underscores or hyphens.',
         )
 
     def test_submit_slug_required(self):