YouTube URLs of the form `https://www.youtube.com/live/Fx3P8B6f30s` and `https://www.youtube.com/shorts/4D7cUR4Kl1g` are functionally equivalent to the standard `https://www.youtube.com/watch?v=<id>` and should be accepted into External URL fields after cleanup to that standard form. When trying, it currently reads "Please link to a specific video. Add channel pages to the relevant artist, label, etc. instead."