[time.js/DataValues] Change calendar IDs to match Denny's guidelines

NOTE: This will break existing time values used in Wikibase Snaks. The UI will not be able to
      initialize without having I4f9215a merged into the Wikibase extension first.

Change-Id: I3743781c874cb332a002b9c4c40dc9db9f680cdd
Merge "[time.js/DataValues] Change calendar IDs to match Denny's guidelines"