As an event organizer, I want to use the same event registration for all of my translated event subpages, so that all users who visit my event page can easily register regardless of which translated event page they access.

Background: We received this feedback from @Sadads - "Hey all, noticing with one of our upcoming events for #WikiForHumanRights interesting Meta-wiki problem/design quirk when a translated subpage of an event, adds event registration -- it creates a separate event: https://meta.wikimedia.org/wiki/Special:EventDetails/287 but if the local translator didn't enable a new event, it doesn't automatically redirect: https://meta.wikimedia.org/wiki/Event:WikiForHumanRights_2024_Information_Session/pt-br . Most translated international landing pages on Commons and Meta would want all of the translated versions to be visible with the one registration."

During our community office hours call on Feb 21, 2024, we also heard from an organizer that they would want this feature. They gave an example of one of their events where this would be useful: https://meta.wikimedia.org/wiki/Event:EmpowerHer_Editathon_2024

More feedback shared on Feb 21: "We are now having the same challenge with this campaign: https://meta.wikimedia.org/wiki/Event:%C2%A1Alto!_Mujeres_haciendo_historia. It's an Iberoamerican campaign organized by 15 Wikimedia stakeholders in 2 languages (Spanish and Portuguese). We would like to keep a single registration link for the whole campaign and thus would like to have the same event registration header everywhere, but when we started translating it into Portuguese, we even got a suggestion to create another registration header/event, which means any person translating (with event organizer rights) can/could by mistake activate it."

Priority: This is high-priority, as we have received multiple requests for this work recently.

Acceptance Criteria:

• Given that an event has enabled event registration on an event page,
  • And the event page has translated subpages,
    • Then the same event registration header should also appear on the translated subpages for the event