Issue #2759461 by DamienMcKenna: hreflang=x-default is no longer removed when...

Issue #2759461 by DamienMcKenna: hreflang=x-default is no longer removed when another hreflang meta tag has the same URL, instead the other tag is removed as it was supposed to be. Added a new [node:url-original] token for showing the URL for the source node for translations; updated the default value for the hreflang=x-default meta tag to use the new token instead of [node:source:url]. Updates to many tests to allow these changes.