Polylang Pro 3.6.7

* Security: Slash metas
* Pro: Fix categories not savedafter the language has been switched in the block editor
* Pro: Fix ACF fields stored as integers instead of strings
* Pro: Fix ACF untranslated posts or terms being copied when creating a new translation
* Pro: Fix PHP notice with ACF when a repeater or group is included in a flexible content
* Pro: Fix "DevTools failed to load SourceMap" warning in browser console
* Update plugin updater to 1.7.1
* Honor the filter "pll_the_language_link" when the language switcher displays a dropdown #506
* Fix "Something went wrong" message when quick editing untranslated post types #508
* Fix wpseo_opengraph deprecated warning #509

* Pro: Re-allow to modify the capability for strings translations
* Pro: Fix redirect for posts having the same slug as a media
* Pro: Fix PHP notice with ACF flexible content
* Pro: Fix a fatal error with InfiniteWP
* Update plugin updater to 1.7
* Fix font in setup wizard

* Pro: Fix untranslated post types filtered by the parameter in the REST API #493
* Fix fatal error when the function idn_to_ascii is not available
* Fix PHP warning warning when a 3rd party plugin declares options not stored in DB in wpml-config.xml #492
* Fix fatal error when a 3rd party plugin declares options stored as objects in wpml-config.xml #494