We probably want to wait until after T187023 is resolved and it's been verified that everything works.
The link in https://phabricator.wikimedia.org/T187031#3996355 can be used as a suggestion for things to convert.
Plain urls (i.e. <ref>[url]</ref> not <ref>[url titlte]</ref>) can be converted using VisualEditor
Added in https://sv.wikipedia.org/w/index.php?title=Wikipedia:Bybrunnen&diff=43278619&oldid=43275897&diffmode=source.
New task (T199700) has been created to handle a bug identified.