Just a heads up about a little big step. As per
Add "Developers" link to footer of Wikimedia wikis using WikimediaMessages extension https://bugzilla.wikimedia.org/show_bug.cgi?id=33464
A Developers link pointing to https://www.mediawiki.org/wiki/Special:MyLanguage/How_to_contribute is visible in the footer of ALL WIKIMEDIA PROJECTS.
Thank you very much MZMcBride, Matmarex, MaxSem, Nemo, Ori and anyone else involved!
Thank you also to all the translators of that string and that page.
Next... revisiting https://www.mediawiki.org/wiki/Developer_hub ?