Change the "Username or Email Address" text string on the PMPro login page (incl. password reset)

change-login-page-username-or-email-address.php

<?php
/**
 * This recipe will change the "Username or Email Address" text string
 * on the login page.
 *
 * 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/
 */
// Let's only do this when on the login page.
function my_pmpro_login_page_only_gettext() {
	// Let's only do this on the login page.
	if ( function_exists( 'pmpro_is_login_page' ) && pmpro_is_login_page() && function_exists( 'my_pmpro_login_change_text_strings' ) ) {
		add_filter( 'gettext', 'my_pmpro_login_change_text_strings', 10, 3 );
	}
}
add_action( 'wp', 'my_pmpro_login_page_only_gettext' );

// Change the "Username or Email Address" text string on the login page.
function my_pmpro_login_change_text_strings( $translated_text, $original_text, $domain ) {
	// Let's only do this for the "paid-memberships-pro" text domain.
	if ( 'paid-memberships-pro' !== $domain ) {
		return $translated_text;
	}

	// Let's change the text strings.
	switch ( $original_text ) {
		case 'Username or Email Address':
			$translated_text = __( 'Email Address', 'paid-memberships-pro' );
			break;
		case 'Please enter your username or email address. You will receive a link to create a new password via email.':
			$translated_text = __( 'Please enter your email address. You will receive a link to create a new password via email', 'paid-memberships-pro' );
			break;
	}
	return $translated_text;
}