* Fix: date picker did not appear when creating a variation variation.
* Fix: dynamic lead time date would not display the "years" if available.
* Tweak: updated language files.
* Fix: lead time format retrieved for variations did not take in consideration the parent product format.
* Fix: the placeholder for the lead time input in variations, displayed the timestamp instead of a formatted date.
* Tweak: allow display of the lead time when doing a REST request.
* Tested up to WooCommerce 6.2
