I tried logging into my account on fawiki just now, but made a typo in my password. Instead of seeing the `Wrongpassword` message in Persian, I was displayed the message in English. See screenshot below. Note that `Wrongpassword` is one of our older messages and has had a Persian translation since [[ https://translatewiki.net/w/i.php?title=MediaWiki:Wrongpassword/fa&action=history | a very long time ago ]]. The [[ https://phabricator.wikimedia.org/source/mediawiki/browse/master/includes/?grep=wrongpassword | only places ]] I can see it being used in core also have not changed recently. Even on fawiki, [[ https://fa.wikipedia.org/wiki/%D9%85%D8%AF%DB%8C%D8%A7%D9%88%DB%8C%DA%A9%DB%8C:Wrongpassword | MediaWiki:Wrongpassword ]] shows the localized translation. I'm not sure which part of code ignores the i18n and decides to show the English message instead.