Updated mediawiki/extensions
Project: mediawiki/extensions/Wikibase  46467a88eb722086718eca0dc85ed780741052c3
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(Bug 44544) Statements are no longer an experimental feature

- patch set 2: use correct bug number
- patch set 3: enable required/related API modules and special pages as well
- patch set 6: 'Special:EntityData' is experimental as well as 'language terms' feature

Change-Id: I257eb917973d9dc29bec7ff9c5c262429f8ef474