Is there also a way to change a specific tag in all topics? I renamed my domain once, there was a method to rewrite all references to the old domain do the new one. Can this also be done with tags? I want to rename a tag, but not confuse users with non-existing tags.
Edit, solved it with tag synonyms 
Although it’s far from ideal, since it will continue the use of old tags and it’s shown in my tags overview and auto-complete. I would really want to replace it fully and obsolete the old one.