artipixel on "[Plugin: Paid Memberships Pro] This is how to define default paypal language as english"

go to the file:
wp-content/plugins/paid-memberships-pro/classes/gateways/class.pmprogateway_paypalexpress.php
Find $additional_parameters
Add this line before:
$nvpStr .= "&LOCALECODE=en_US";

and there you go!

https://wordpress.org/plugins/paid-memberships-pro/