http://en.wikipedia.org/w/index.php?title=Hein%C3%A4vesi_Church&action=edit
On the bottom of this edit page, there are two collapsible templates and categories list. How to enable this function?
It looks like only English version wikipedia have this collapsible list neither zh nor ja.
It appears to be part of extension:Vector.
On setptember 27 there were the following entries in the server log:
23:13 logmsgbot: olivneh synchronized php-1.20wmf12/extensions/Vector/modules/ext.vector.footerCleanup.css 22:50 logmsgbot: olivneh synchronized wmf-config 22:05 logmsgbot: olivneh synchronized php-1.20wmf12/extensions/E3Experiments
Which would indicate that it is part of vector extension which was deployed as part of the E3 teams work. (E3 team seems to just do random small messings with the interface of only enwikipedia)
To get it enabled on another (Wikimedia) wiki, file a bug in bugzilla with Product set to Wikimedia, component set to site requests, and having the keyword shell. In the bug ask for $wgVectorFeatures['footercleanup']['global'] = true; to be set for your wiki. Typically one should also link to a discussion on the wiki in question so that the dev dealing with the request knows that the feature requested is actually wanted on the wiki in question.
