Modify wp-login.php labels: Username to Email

Found this here: https://wordpress.org/support/topic/how-to-change-the-text-labels-in-userpass-box-on-login-page/

The other answer here didn’t work for me, but this one did.

Just in case this helps anyone.

add_filter( 'gettext', 'register_text' );
add_filter( 'ngettext', 'register_text' );
function register_text( $translated ) {
    $translated = str_ireplace(
        'Username or Email Address',
        'Your Custom Text',
        $translated
    );
    return $translated;
}