Polylang Pro 3.6.5

Pro: Fix terms not filtered by the current language in the block editor custom taxonomy component panel
Pro: Fix fatal error when using plain permalinks on multisite
Pro: Fix rewrite rules incorrectly refreshed when saving strings translations
Fix incorrect rewrite rules leading to error 404 on mutisite #1366
Fix fatal error when using symlinked MU plugins that are not in open_basedir #1368

* Pro: Security: Fix unsafe custom style injection in navigation language switcher block

* Pro: Register a default (empty) value for the "lang" param when listing posts and terms in REST API
* Pro: Fix categories list refresh when the language of a post is changed in the block editor
* Pro: Fix store "pll/metabox" is already registered
* Add Kirghiz to the predefined list of languages #1308
* Fix incorrect flag url when WordPress is installed in a subfolder #1296
* Fix wrong home page url in multisite #1300