Entity label callbacks should support an $options parameter (language codes for t())

This patch allows the $options argument.

Hm, can you help work on this one Dave? It would be very appreciated. Thanks!

Maybe an updated issue summary and/or a specific remaining tasks list would let someone help with this?
This looks like it might be challenging.

Dave, #2 seems still needed. Any details you can add?

we're just using the general needs issue summary update tag.

removing reroll tag since this is beyond a reroll.

Needs reroll

The function on my patch does not even exist anymore, and the one in it's place (user_format_name()) is deprecated, so it should be obvious, it's not a matter of reroll anymore.

Concerning this issue, it's not very clear to me what needs to be changed, since all of those change in core. Is Drupal\user\Entity\User::getUsername() ? If so, must also change Interface, right? By widening the scope, you mean other entities also need similar changes? Which ones?

In Drupal 8 now you can just get the translation desired and pass that along:

$account->getTranslation('de');
whatever_works_with_account($account);

Updating tags per Issue tags field and Issue tags -- special tags and for issue #3565085: Drupal core issue tag cleanup.