Advanced Custom Fields Pro 6.4.0.1

Fix - Fixed bug causing multisite login redirect issues.
Fix - Fixed bug causing validation issues in older versions of Firefox.
Fix - Fixed bug causing duplicate Select2 instances when adding a widget via drag/drop.
Dev - Improved WPML compatibility by using `$sitepress->get_current_language()` instead of `ICL_LANGUAGE_CODE`.
Dev - Improved validation JS with new Validator model and logic.

* Fix - Fixed bug causing field groups to disappear when selecting a taxonomy term with WPML active.
* Tweak - Added more Dark Mode styles.
* Tweak - Improved DB upgrade prompt, functions and AJAX logic.
* Tweak - Improved the "What's New" admin page seen after DB Upgrade.
* Dev - Added new location rules filters.

* New - Added Dark Mode styles for the [Dark Mode Plugin](Dark Mode).
* New - Added "Value Contains" condition to the Select field type.
* New - Added support for the WooCommerce product type dropdown to trigger "update metaboxes".
* Tweak - Improved acf.screen model responsible for "updating metaboxes" when changing post data.
* Tweak - Removed user fields from the multisite "Add New User" page.
* Fix - Fixed bug preventing some tinymce customizations from working.
* Fix - Fixed JS bug throwing "preference" error in console.
* Dev - Added action 'acf/enqueue_uploader' triggered after the hidden "ACF Content" editor is rendered.