Change "Membership" to a different word with Paid Memberships Pro

my_gettext_membership.php

// Change 'Membership' to 'Subscription' for Paid Memberships Pro.
function my_gettext_membership( $translated_text, $text, $domain ) {
	if( "paid-memberships-pro" == $domain ) {
		$translated_text = str_replace( "Membership Level", "Subscription", $translated_text );
		$translated_text = str_replace( "membership level", "subscription", $translated_text );
		$translated_text = str_replace( "membership", "subscription", $translated_text );
		$translated_text = str_replace( "Membership", "Subscription", $translated_text );
	}
	return $translated_text;
}
add_filter( "gettext", "my_gettext_membership", 10, 3 );