Remove language subdomains for wikidata.org

Wikidata should be accessed via www.wikidata.org only, everything else
(e.g. en.wikidata.org or www.en.wikidata.org) should not be used and is
hence removed to avoid confusion and cache invalidation issues, among
others.

Bug: 45005
Bug: 54273
Change-Id: I313d8643ccdd5c3790a87883a4f8ec258f91c103
Merge "Remove language subdomains for wikidata.org"