  
  
  class ParseError(APIException):
      status_code = status.HTTP_400_BAD_REQUEST
      default_detail = _("Malformed request.")
  
  
  class AuthenticationFailed(APIException):
      status_code = status.HTTP_401_UNAUTHORIZED
      default_detail = _("Incorrect authentication credentials.")
 
</s> remove     default_detail = _("Incorrect authentication credentials.")
 </s> add     default_detail = _('Incorrect authentication credentials.') </s> remove     default_detail = _("Authentication credentials were not provided.")
 </s> add     default_detail = _('Authentication credentials were not provided.') </s> remove     default_detail = _("Not found.")
 </s> add     default_detail = _('Not found.') </s> remove     default_detail = _("Unsupported media type \"{media_type}\" in request.")
 </s> add     default_detail = _('Unsupported media type "{media_type}" in request.') </s> remove     default_detail = _("You do not have permission to perform this action.")
 </s> add     default_detail = _('You do not have permission to perform this action.')
    default_detail = _('Malformed request.')
  
  
  class ParseError(APIException):
      status_code = status.HTTP_400_BAD_REQUEST
    default_detail = _('Malformed request.')
  
  
  class AuthenticationFailed(APIException):
      status_code = status.HTTP_401_UNAUTHORIZED
      default_detail = _("Incorrect authentication credentials.")
keep keep keep keep replace keep keep keep keep keep
 prefer single quotes in source and double quotes in user visible strings; add some missing full stops to user visible strings 
rest_framework/exceptions.py