* Checkout v2: Play sound when invoice is paid
Closes#5085.
* Refactoring: Use low-level audio API to play the sound
Allows to play the sound regardless of browser permissions.
* Add audio file detection
* Use model state for file upload errors
* Add default sound and customizing option
* Fix mp3 detection
* Add sounds
* Update defaults
* Add nfcread and error sounds
* Improve label wording
* Replace sound
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Co-authored-by: nicolas.dorier <nicolas.dorier@gmail.com>
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