jp_lowercase_p_plz.php

<?php
/*
Plugin Name: Lowercase p plz for Jetpack!
Plugin URI:  https://gist.github.com/georgestephanis/bd0c7e0aca85ab8a361f
Description: Corrects `JetPack` to `Jetpack`
Version:     1.0
Author:      George Stephanis
Author URI:  http://stephanis.info
*/

/*
 * Forked version of `capital_P_dangit()` from core.
 */
function jp_lowercase_p_plz( $text ) {
	// Simple replacement for titles
	$current_filter = current_filter();
	if ( 'the_title' === $current_filter || 'wp_title' === $current_filter ) {
		return str_replace( 'JetPack', 'Jetpack', $text );
	}
	// Still here? Use the more judicious replacement
	static $dblq = false;
	if ( false === $dblq ) {
		$dblq = _x( '&#8220;', 'opening curly double quote' );
	}
	return str_replace(
		array( ' JetPack', '&#8216;JetPack', $dblq . 'JetPack', '>JetPack', '(JetPack' ),
		array( ' Jetpack', '&#8216;Jetpack', $dblq . 'Jetpack', '>Jetpack', '(Jetpack' ),
	$text );
}

add_filter( 'the_content',  'jp_lowercase_p_plz', 11 );
add_filter( 'the_title',    'jp_lowercase_p_plz', 11 );
add_filter( 'wp_title',     'jp_lowercase_p_plz', 11 );
add_filter( 'comment_text', 'jp_lowercase_p_plz', 31 );