Is 'Hide this update' button necessary?

[afragen]

While working on #51774 I see that non 'en_US' installations have a second button to Hide this update. This appears on the update-core.php page on non en_US locales.

I'm not certain what's being hidden here or even why. There were thoughts that it's related to translation only updates.

It seems to be referenced in undismiss_core_update() and get_core_updates() as a way to dismiss a core update. If this is correct, then since 5.6 now has many ways to dismiss core update notices, is this even necessary.

I'm looking for some education and understanding. Thanks.

[helen]

I think this is a dupe of #49407.

[afragen]

Duplicate of #49407.