Special:NoticeTemplate assumes that the content language is English (also see the comment in https://phabricator.wikimedia.org/diffusion/ECNO/browse/master/i18n/qqq.json;26b909775ec444639ca20959a18626d4443d4eb6$64 ), by:
- having the “original” column in the translation list hardcoded as English (see MediaWiki:Centralnotice-english), and, more importantly by
- creating the message key by comparing its language to 'en' (hardcoded!), not to the content language of the wiki, which means that on any wiki with a different content language, the English message text is fetched (or saved to when translating through this special page) from [[MediaWiki:Centralnotice-something-something]], and the text in the content language is fetched from [[MediaWiki:Centralnotice-something-something/lang]], which are both wrong.
See SpecialNoticeTemplate::showView()
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Severity: minor