pmpro-change-extra-fields-text-string.php

<?php
/**
 * Change the "Extra Fields:" text string to "Member Information:".
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */
function my_pmpro_change_extra_fields_text_string( $translated_text, $text, $domain ) {
	if ( 'paid-memberships-pro' === $domain && 'Extra Fields:' === $text ) {
		$translated_text = __( 'Member Information:', 'paid-memberships-pro' );
	}
	return $translated_text;
}
add_filter( 'gettext', 'my_pmpro_change_extra_fields_text_string', 20, 3 );