Last modified: 2014-09-25 11:46:12 UTC
Some Wikipedias use categories to find all articles which have a good or featured version in some other Wikipedia. This categories can and should be replaced by a special page on wikidata.org where one can enter a badge and a wiki and then gets all items which have a sitelink to that wiki which has the specified badge.
These wikis include French, Russian, Spanish, Catalan, and Portuguese. It shouldn't be implemented in Wikibase client? like Special:UnconncetedPages My reasoning is that the list you're implying can be obtained by getting Category:Featured articles directly but getting the list of articles in certain Wiki that their article in another Wiki is featured is not easy
No, the special page should be on the repo because this is the central place to query things. We might also create a special page on client which can query for all good or featured article on that particular wiki but I don't see the value such a special page would add to the special page on Wikidata.