[Escalated to WPML Developers team] wcml_register_endpoints_query_vars registration switches locale

Or this is just as equivalent

$query_vars['view-subscriptions'] = $obj->get_endpoint_translation('view-subscriptions');

And it would be a simpler example, but sadly as I already explained other woocommerce extensions like wishlist-for-woocommerce are already registering their endpoint like the example shows

So it is the `WCML_Endpoints::get_endpoint_translation`method that needs it's signature changed