e.g. https://beta.musicbrainz.org/artist/886999f0-220a-48b6-a71c-b93e534de42b links to https://en.wikipedia.org/wiki/100%%20(band) which doesn't work, the proper URL is https://en.wikipedia.org/wiki/100%25_(band)

(We could also get rid of an unnecessary redirect by changing spaces to underscores instead of %20...)