Thank you very much to everyone who contributed so far:
when I sent my first email, only 10 languages had complete translations for this group of interface messages, and just one day later we have 28!
Give yourself a pat on the back for this tremendous accomplishment.
(As detailed on the Phabricator task [0], I have also published a heads-up about the change at some wikis, also courtesy of tireless "weekend translators" including WMF staff.
You are welcome to do the same at your wiki (small ones, sister projects, etc.) if you feel like the note on TechNews may not be enough: you can translate my message locally, or on Meta [1].
If you find it worthwhile, please consider delivering the announcement in a language which is not English. You can find a list of wikis where it may make sense to use a "fallback language" instead at
mediawiki.org [2].)
Enjoy the rest of your weekend!
With much respect and appreciation,
Elitre (WMF)
(For example, Sardinian is a language spoken in Italy: since there is no translation for the announcement in Sardinian but there is one in Italian, it may be OK to publish a text in Italian rather than in English there, if no translation to Sardinian can be obtained.)