Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  d01dcf0dfe801ad3c3ddb96a3376ec981cf937bd

(bug 51876, hotfix) ensure interwiki links render correctly in sidebar

the proper solution is to make sure the site_identifiers can and is
populated correctly.  this makes things work in the meantime.

Change-Id: If404ebb43d7da161bdd61bf4630b8866edcf4eab