The contents of this page are supposed to define the sidebar: http://solidarity.coop/wiki/MediaWiki:Sidebar
There's a "help" line in there that wasn't (and isn't) showing up in the sidebar; I added a "test" line just now, and it's not showing up either.
Your link (** test|test) is visible at my wiki. May be you have to comment out this lines of code in your skin.
https://www.mediawiki.org/wiki/Manual:Interface/Sidebar#Remove_toolbox_sections_.28On_Vector_template.29_MW_v_1.24.1 --Metathom (talk) 16:29, 27 March 2015 (UTC)
