Initializes the upgrader.

Description

This will set the relationship between the skin being used and this upgrader, and also add the generic strings to WP_Upgrader::$strings.

Additionally, it will schedule a weekly task to clean up the temporary backup directory.

Source

public function init() {
	$this->skin->set_upgrader( $this );
	$this->generic_strings();

	if ( ! wp_installing() ) {
		$this->schedule_temp_backup_cleanup();
	}
}

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