Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  2970434f539773db8882bd25b729923f51718862

(bug #55513) Baseline for Quantity data type.

CAVEAT: No UI support yet (bug #55515)

IMPORTANT: Requires I1d1cb7367d7de3

Change-Id: Ib6b217aff752b64a46dd872510d49525f5578063