Switch Wikidata back to previous version of Wikibase etc.

There are various issues with formatting dates in non-English,
that might take some time to fix and be too much to backport.

Best to switch Wikidata back to the previous version of Wikibase etc.,
and not inconvenience users.

(had we had time on test.wikidata, perhaps we would have resolved
this and not have to do this)

Change-Id: I814ac4e169747e24d9b229b86c57bfa80603fe81