Wordpress: Filter polylang language navigation

filter_language_navigation.php

<?php
// Only show the provided languages in the language navigation (for polylang).
add_filter(
	'wp_nav_menu_objects',
	function ( $sorted_menu_items, $args ) {
		if ( 'language_navigation' !== $args->theme_location ) {
			return $sorted_menu_items;
		}
		return array_filter(
			$sorted_menu_items,
			function ( $item ) {
				return in_array( $item->lang, [ 'fi', 'en-GB', 'sv-SE' ], true );
			}
		);
	},
	10,
	2
);