Polylang for WooCommerce 2.1

* Improve performance when saving product variations.
* Add support of coming soon mode introduced in WC 9.1. Requires WC 9.3.
* Add support of the global unique ID introduced in WC 9.2.
* Allow to translate the local pickup title, name and location details
* Fix impossibility to disable a product variation
* Fix SKU lock in REST API since WC 9.2. Requires WC 9.3.
* Fix store blocks not translated when using one domain per language.

* Security: Fix query returning all subscriptions regardless of their customers.
* Fix deprecated notices in Bookings and Subscriptions integrations.

* Fix new account email sent in wrong language when using the checkout block
* Fix translation of gateways and shipping options in the checkout block
* Fix compatibility with Yith Ajax Search 2.0+. Props Salvatore Strano from Yith