Fix up new Django 3.0 deprecations

Mostly text based: force/smart_text, ugettext_*

awx/main/models/label.py

@@ -3,7 +3,7 @@
 
 # Django
 from django.db import models
-from django.utils.translation import ugettext_lazy as _
+from django.utils.translation import gettext_lazy as _
 
 # AWX
 from awx.api.versioning import reverse