Polylang Pro 3.6.5

* Pro: fix original post not assigned to a new translation when the languages sidebar is closed
* Pro: Attempt to fix zip file corrupted on some installations when exporting string translations
* Support session cookie with the pll_cookie_expiration filter #835
* Fix javascript error when a plugin defines its own editor for translated post types #837
* Fix languages displayed in screen options when editing a term #850
* Cache: fix post type archive cache not cleared when saving a post #828

* Improve performance in the pages (or hierarchical post types) list table
* Fix an ajax conflict with WooCommerce License manager

* Fix a warning when a language is corrupted in database (term_language missing)
* Fix confirmation modal with WooCommerce and WordPress < 5.6
* Fix an ajax conflict with WooCommerce Tree Table Rate Shipping and HubSpot All-In-One Marketing