@siebrand used to give us a list at https://toolserver.org/~siebrand/tnstats.php; however Toolserver is down.
It would be good if translation administrators could see how many users are subscribed via Special:TranslationSignup to which language.
Thank you.
See also T129370: Create a special page to have lists of translators, based on Extension:TranslationNotifications which requests adding a page for the list of users, not just a count.
Can that list be generated via tool labs / Quarry ? If yes, which table/db is this using?