Issues trying to modify relationship types

We need to add the relationship type "Polyamorous" to the list of available choices and I tried modifying the config.json file as per the information at https://stackideas.com/forums/add-more-relationship-types. I also created a new language override. So now that item does show up, but when selected and you try to save the updated profile, you get the error message Relationship target is invalid. so I guess there needs to be another change somewhere? I've attached the updated json file.