Modify mixins.py to make sure that the 415 (Unsupported Media Type) returns its…

Modify mixins.py to make sure that the 415 (Unsupported Media Type) returns its error in the 'detail' key instead of in the 'error' key (for consistency with all other errors).

djangorestframework/mixins.py

@@ -181,7 +181,7 @@ class RequestMixin(object):
                 return parser.parse(stream)
 
         raise ErrorResponse(status.HTTP_415_UNSUPPORTED_MEDIA_TYPE,
-                            {'error': 'Unsupported media type in request \'%s\'.' % 
+                            {'detail': 'Unsupported media type in request \'%s\'.' % 
                             content_type})
 
     @property