We emit <span id="..." typeof="mw:FallbackId"></span> inside headings
when necessary to provide backward compatibility with pre-HTML5
section ids. These are mostly harmless inside VE --- they become hidden
alienated nodes, which are then safely ignored by Parsoid during html2wt
even if they manage to migrate outside of a heading --- but it's a
little safer to strip them.
Change-Id: I07d0fcf54427ab02d4930cff183d3e5579a99306
This replaces ve.safeDecodeURIComponent(...).replace( /_/g, ' ' ) . This action
is really specific to the quirks of mediawiki title processing.
Change-Id: Ia9e525c9340e6de9e485355899996c97867ccb48
