About [[MediaWiki:Page-creation-email-subject/en]]
Fragment of a discussion from Translating talk:MediaWiki
In English, it's superfluous in any case, and only used so that it's explicit that GENDER is supported. It doesn't really matter where the GENDER parser function is used. You changed it recently, and functionally, it's still the same...
I see I was referring to https://gerrit.wikimedia.org/r/#/c/45173/1/languages/messages/MessagesEn.php . Hope I didn't confuse you more...