MediaWiki 1.19/Communications

Communications plan
Aim: spread the word that the deployments are gonna probably be coming in February, and tell them 3 things:
 * 1) test now!!  on the test deployment site for your wiki!  I'm especially looking at you, Commons or sites with unusual gadgets or something!
 * 2) Do you have some unusual technical thing -- user scripts, gadgets, unique bots, etc. -- set up on your wiki such that we should stagger you in a different stage than we had thought?


 * Initial heads-up sent by Sumana to wikitech-l, wikitech-ambassadors

Pre-deployment heads-up distribution list

 * Wikimedia tech blog ✅
 * mail:wikimediaannounce-l, mail:wikitech-l, mail:wikitech-ambassadors, mail:foundation-l, and all project-specific lists ✅
 * m:Global message delivery ✅

Pre-deployment heads-up message

 * Moved to MediaWiki 1.19/Deployment announcement.

Deployment notice

 * Generic maintenance notice ✅, continue to update translations
 * m:Wikimedia maintenance notice ✅
 * Set up SiteNotices for phases 1, 2 & 4
 * Set up CentralNotice for phases 3 & 5.
 * Set up social media announces

1.19 release
Channels: mediawiki-l, mediawiki-announce, Wikimedia blog, social media channels. See also Release checklist