Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  e786453e0a3ca17f4cd80b85b2914f1f6ab936e1
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(bug 43278) Limit labels etc to 250 characters.

This patch includes several changes needed to make this testable.

Change-Id: I4339e526c7f071800a3c97a12bfc4e78c9587c0a