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Extend deleteEqualMessages.php to delete redundant overrides that are the same as fallbacks
Open, Needs TriagePublic

Description

There are mainly two types of old redundant overrides since T229992 is done:

  • Transclude the locally created fallback: {{MediaWiki:message-key/lang-code|1={{{1}}} }} (/lang-code and params part are optional)
  • Repeat the exactly same message as the locally created fallback

We may want to clean up these messes for interface admins and avoid checking manually from Special:AllMessages.