public function feedback( $string ) {
		if ( isset( $this->upgrader->strings[ $string ] ) ) {
			$string = $this->upgrader->strings[ $string ];
		}

		if ( false !== strpos( $string, '%' ) ) {
			$args = func_get_args();
			$args = array_splice( $args, 1 );
			if ( $args ) {
				$args   = array_map( 'strip_tags', $args );
				$args   = array_map( 'esc_html', $args );
				$string = vsprintf( $string, $args );
			}
		}
		if ( empty( $string ) ) {
			return;
		}

		$this->messages[] = $string;
	}