Change the text "Membership" to "Package" whever it appears in PMPro.

my_gettext_membership_to_package.php

/*
	Change the text "Membership" to "Package" whever it appears in PMPro.
	Add this code to a custom plugin.
*/
function my_gettext_membership_to_package( $translated_text, $text, $domain )
{
	if($domain == "pmpro" || $domain == "paid-memberships-pro") {
		$translated_text = str_replace('Membership', 'Package', $translated_text);
		$translated_text = str_replace('membership', 'package', $translated_text);

		//can add additional translations here
  	}
  
	return $translated_text;
}
add_filter('gettext', 'my_gettext_membership_to_package', 10, 3);