problem translation

hi

i have create a multilingual site with wpml plugin ( italian and english ) and i use Simple Paypal Shopping Cart for manage a subscription, when i use the default langue it’s all ok but if i select the english language the plugin is not translated.

i see that the PO file in the language directory is present all translations are ok, but don’t work

where i wrong ?

thanks

https://www.ads-software.com/plugins/wordpress-simple-paypal-shopping-cart/