Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  4ed464cc4f4f6bb0dcfedf57c7593eb5a2b2a10f

Simple diff visualization

- todo: make sure all cases are covered, such as reference change
- further design improvements
- tests
- there's opportunity for DiffView and other places to share code

Change-Id: I4459f274b092a4c0aa707af8bafd175775b2c51e