Fix up new Django 3.0 deprecations

Mostly text based: force/smart_text, ugettext_*

awx/main/models/base.py

@@ -4,7 +4,7 @@
 # Django
 from django.db import models
 from django.core.exceptions import ValidationError, ObjectDoesNotExist
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 from django.utils.timezone import now
 
 # Django-Taggit