We unintentionally left some cruft in when removing the old login and create account forms.
Specifically, loginstart, loginend, signupstart, signupend (and possibly others) were removed from use, but not removed entirely. This also needs to be documented at https://www.mediawiki.org/wiki/Account_creation_user_experience/Strings#Removed_old_messages
See also T58455: Text at MediaWiki:Signupstart not shown
Trello card: fPSXLKrn
- column: Bucket o' Mess
- labels: Technical Debt & Refactoring (orange)