Replace !!pmprorate_downgrade_text!! wording using gettext

change-pmprorate-downgrade-text.php

<?php
/**
 * Change the wording of the Prorations Downgrade Text.
 * Add this code to your site by following this guide - https://www.paidmembershipspro.com/documentation/templates/customizing-via-a-custom-plugin/
 */
function my_pmpro_change_text( $translated_text, $text, $domain ) {
	if ( $domain == 'pmpro-proration' ) {
		if ( $text == 'Downgrading to %s on %s.' ) {
			$translated_text = 'Changing to %s on %s.'; // Adjust the wording here.
		}
		if ( $text == 'Downgrading to %s.' ) {
			$translated_text = 'Changing to %s.'; // Adjust the wording here.
		}
	}
	return $translated_text;
}
add_filter( 'gettext', 'my_pmpro_change_text', 20, 3 );