(bug 47726) Adds a link to corresponding Wikibase Item to action=info

Adds a link to the corresponding Wikibase Repo item to action=info of
the corresponding Wikibase Client article page. The Item ID on Wikibase Repo is used as anchor text.

Bug: 47726
Change-Id: Ifa6ca0f0e6180d1eacf4cfae3e1746b40cd34be0
Merge "(bug 47726) Adds a link to corresponding Wikibase Item to action=info"