A tag created by mistake, it doesn’t show on /tags list,
neither in the tags group, even /tags/{tag}
but only appear when you are going to have a new topic,
it’s just right there, couldn’t find any way to let it disappear 
Add the tag to a topic, then it’ll show up in /tags and you’ll be able to delete it.
It works! thank you soooo much!!!
Staff members will now see all the tags (making it easier to delete unused tags) 