Merge tags #76
Description
Post migration we have a lot of duplicated tags, in part because the karaokes can come from two different sources (our original base and Mugen), and sometimes human error.
Merging tag B into tag A would mean that after the merge:
- All karaoke entries in relation with tag B should be related to tag A
- Tag B's name is now an additional name of tag A (if it is not already)
- Tag B's additional names are now additional names of tag A (if they are not already)
In the case of Media the media type of tag B is ignored (we assume that it can be wrong and be a valid reason to merge)