Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  0519e76d2d113680e9e9f045515188ae34939788

(bug 48224) Format site link already used message with correct link

Together with https://gerrit.wikimedia.org/r/#/c/64083/, this would improve error messaging.

Change-Id: Ie9daf6bb4094ac8e41a3a874809cedd5ae2031a3