Configuration settings are the most translated kind of pages on mediawiki.org, but the translations are still very few.
On the other hand, the Configure extension duplicates all the settings' summaries and has over 23 thousands translations for them.
I'm opening the bug to see what's technically feasible. The discussion on how to manage those pages should continue on the wiki, see URL; for now the reactions seem to be that it's ok to make them translatable in whatever way works and as long as someone else does it. ;-)
Matma Rex is doing lots of updates to the extension (method still to be figured out exactly, see I14f5815a) and many translations may need to updated, but it's a pity to waste those translations and it's a nightmare to copy them around.
Is it possible to do a dummy install of the extension on mediawiki.org just to use its messages? Like, $wgConfigureEditableSettings with a single dummy config, the special pages unset and the required permissions assigned to no group.