Per title, and TCG recommendations. Not a blocker at this stage I think.
I've prepared the page for translation: https://www.mediawiki.org/w/index.php?title=Help:Extension:Newsletter&diff=2508553&oldid=2397216, but there is still a comment in the source text that refers to a talk page discussion, which has not seen activity in 6 months. Is it still relevant?
Thank you @Elitre for this task, and thank you @Mainframe98 for the quick response and the good catch. I have updated section zero, removing the source comment as well. I really hope the extension will be deployed in July, but perhaps it is better to wait to mark the page for translation until the deployment is confirmed.
I've added a template to the page linking to this task so it will not be marked for translation until the deployment is confirmed. (https://www.mediawiki.org/w/index.php?title=Help:Extension:Newsletter&diff=2508978&oldid=2508975)
T173111: Testing Newsletter extension in test.wikipedia.org is close to completion and no changes affecting the UI (and therefore the Help pages) are expected. I think the page can be marked for translation.