Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  9851b181ba6de39944fb25a01de2db8e51ca7dd8
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(bug 43291) reference related bugfix in wb.Claim.newFromJSON

Comes with some documentation cleanup in data model related JS files.

Change-Id: If6264411f1ea1bea407b01090977ac82c22dde30