In case a wiki has already some customization for backlink markers, we want to display some information to the users.

Specification

The grey box will only be displayed, when a customization has been made for the current wiki.

Mockup:

Text for the messagebox:

Your site includes a legacy backlink customization using the MediaWiki:Cite references link many format message. Please follow the instructions on the help page for migrating to the new style.

Implementation notes:

• This is the i18n key we want to check for: cite_references_link_many_format_backlink_labels (Relevant GlobalSearch: https://global-search.toolforge.org/?namespaces=8&q=.%2A&regex=1&title=Cite%20references%20link%20many%20format%20backlink%20labels)
• codex: https://doc.wikimedia.org/codex/latest/components/demos/message.html#auto-dismiss

TODO

• What pages do we want to link to?
• Move the box to the correct position. (Can be done later when the code structure is more clear.)

Outcome for review