  from django.db import models
  from django.utils.encoding import python_2_unicode_compatible
  
  # Prior to Django 1.5, the AUTH_USER_MODEL setting does not exist.
  # Note that we don't perform this code in the compat module due to
  # bug report #1297
  # See: https://github.com/tomchristie/django-rest-framework/issues/1297
 
</s> remove                                 on_delete=models.CASCADE)
    created = models.DateTimeField(auto_now_add=True)
 </s> add                                 on_delete=models.CASCADE, verbose_name=_("User"))
    created = models.DateTimeField(_("Created"), auto_now_add=True) </s> remove     username = serializers.CharField()
    password = serializers.CharField(style={'input_type': 'password'})
 </s> add     username = serializers.CharField(label=_("Username"))
    password = serializers.CharField(label=_("Password"), style={'input_type': 'password'}) </s> remove     key = models.CharField(max_length=40, primary_key=True)
 </s> add     key = models.CharField(_("Key"), max_length=40, primary_key=True)
from django.utils.translation import ugettext_lazy as _
  from django.db import models
  from django.utils.encoding import python_2_unicode_compatible
from django.utils.translation import ugettext_lazy as _
  
  # Prior to Django 1.5, the AUTH_USER_MODEL setting does not exist.
  # Note that we don't perform this code in the compat module due to
  # bug report #1297
  # See: https://github.com/tomchristie/django-rest-framework/issues/1297
keep add keep keep keep keep keep
 enhancement #3886 Internationalization in admin interface rest_framework.authtoken

+ verbose_name in models.Token fields
+ Meta-options verbose_name & verbose_name_plural
+ Labels in AuthTokenSerializer fields in case of usages in Brousable API
+ provide AppConfig class as described in django documentation with verbose_name came through ugettext_lazy 
rest_framework/authtoken/models.py