Source

File: wp-includes/formatting.php

function capital_P_dangit( $text ) {
	// Simple replacement for titles.
	$current_filter = current_filter();
	if ( 'the_title' === $current_filter || 'wp_title' === $current_filter ) {
		return str_replace( 'Wordpress', 'WordPress', $text );
	}
	// Still here? Use the more judicious replacement.
	static $dblq = false;
	if ( false === $dblq ) {
		$dblq = _x( '“', 'opening curly double quote' );
	}
	return str_replace(
		array( ' Wordpress', '‘Wordpress', $dblq . 'Wordpress', '>Wordpress', '(Wordpress' ),
		array( ' WordPress', '‘WordPress', $dblq . 'WordPress', '>WordPress', '(WordPress' ),
		$text
	);
}