* Add compatibility with WordPress 5.8

* Raise Minimum WordPress version to 5.4

* Pro: Allow to filter blocks by language in the widget block editor

* Pro: Allow to export and import XLIFF files for string translations

* Pro: Add the language switcher in the navigation block (experimental)

* Pro: Replace dashicons by svg icons in the block editor

* Pro: The Events Calendar: Add compatibility with Views V2 (only for sites using only one domain)

* Pro: Fix + icon displayed in the block editor sidebar when the user cannot create a translation

* Add a warning section to the site health for posts and terms without languages #825

* Require the simplexml extension in the site health if a wpml-config.xml is found #827

* Remove the information about the WPML compabitility mode in settings #843

* The browser preferred language detection is now deactivated by default

* The media are now untranslated by default

* Highlight the language filter in the admin toolbar when it's active #821

* Allow to query comments in multiple languages (just as posts and terms) #840

* Don't disable the translation input field in the classic metabox #841 Props Onatcer

* Optimize all images including flags #848 Props lowwebtech

* Don't redirect if WordPress doesn't validate the redirect url to avoid redirects to /wp-admin/ #879

* Fix media appearing to have a language after the language is changed in the media library grid view  #807

* Fix media not all deleted when bulk deleting from the grid view of the media library #830

* Fix when more than one language switcher are added to the same menu #853

* Fix PHP notice when adding a CPT archive link to a menu #868 Props davidwebca

* Fix a conflict with the WooCommerce cart translation and cache plugins #876