The SO question How to get current time in Python? has cross-site associated question on ruSO:
The banner says: “this question has answers on Stack Overflow in Russian: ”.
Such banner only visible to users who have been detected by site as Russian-speaking.
In this case target question has been deleted, hence user without 10k reputation on ruSO will see a 404 page after clicking. This is not good behavior and I think algorithm for enabling the banner should be extended, in particular there should be a check that question has not been deleted.