Change text for add paypal express to checkout translation strings

change-add-paypal-express.php

<?php
// Add this code below to your PMPro Customizations plugin - http://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
add_filter( 'gettext', 'change_text_for_add_paypal_express', 20, 3 );
/**
 * @link http://codex.wordpress.org/Plugin_API/Filter_Reference/gettext
 */
function change_text_for_add_paypal_express( $translated, $text, $domain ) {
	switch ( $domain ) {
		case 'pmpro-add-paypal-express':
			switch ( $text ) {				
				case 'Check Out with a Credit Card Here':
					$translated = __( 'Your translation here', 'pmpro-add-paypal-express' );
					break;				
			}
			break;
	}
	return $translated;
}
add_filter( 'gettext', 'change_text_for_add_paypal_express', 10, 3 );