BUGFIX: Restore XLIFF translation fallback: Use canonical string cast and add comment
BUGFIX: Restore XLIFF translation fallback: Use canonical string cast and add comment

* `$locale` is now cast the way it is in `\Neos\Flow\I18n\Service`
* Added a small comment why the locale chain is reversed
neos/flow,neos/flow,neos/flow,neos/flow