Message groups missing from translation tool list
Fragment of a discussion from Translation UX feedback
OK now I've got it - thanks for the hints. In Special:LanguageStats you have to click on MediaWiki, then MediaWiki Extensions, then scroll down to Extensions used by Wikimedia and click on that, then scroll down again to Extensions used by Wikimedia - Main and then click on that! I seem to remember that these sub-groups used to be listed directly under their 'parent' group so that they were easy to spot. Now I have to remember all the moves, and as you can plainly see, I'm not succeeding!
In the new Special:Translate, you have to click on Message group All then put the message group name in the search box. That's nice and simple when you know how!