public static function init() {
		add_action( 'icl_make_duplicate', array( __CLASS__, 'duplicate_post' ), 10, 4 );
		/*
		add_filter( 'pum_popup', array( __CLASS__, 'pum_popup' ), 10, 2 );
		TODO Further testing of this filter may prove 80+% of the following unneeded.
		*/
		add_filter( 'pum_popup_get_display', array( __CLASS__, 'popup_get_display' ), 10, 2 );
		add_filter( 'pum_popup_get_close', array( __CLASS__, 'popup_get_close' ), 10, 2 );
		add_filter( 'pum_popup_get_triggers', array( __CLASS__, 'popup_get_triggers' ), 10, 2 );
		add_filter( 'pum_popup_get_cookies', array( __CLASS__, 'popup_get_cookies' ), 10, 2 );
		add_filter( 'pum_popup_get_conditions', array( __CLASS__, 'popup_get_conditions' ), 10, 2 );
		add_filter( 'pum_popup_get_theme_id', array( __CLASS__, 'popup_get_theme_id' ), 10, 2 );
		add_filter( 'pum_popup_mobile_disabled', array( __CLASS__, 'popup_mobile_disabled' ), 10, 2 );
		add_filter( 'pum_popup_tablet_disabled', array( __CLASS__, 'popup_tablet_disabled' ), 10, 2 );
	}