WooCommerce Poor Guys Swiss Knife

This plugin is now discontinued and has bugs, so I would strongly suggest that you use WooCommerce Checkout Field Editor Pro instead.

How to translate WooCommerce Poor Guys Swiss Knife labels with WPML

1. Go to WMPL > String Translation.
2. Check “Auto-register strings only when logged in as an administrator” and press Apply.
3. On your site’s frontend, visit the checkout page. Wait until WPML scans for page strings.
4. When the page has fully loaded, go to WMPL > String Translation and only the strings within the wcpgsk domain.
5. You are now ready to translate them!

How to get a custom field using PHP functions

$my_custom_field = get_user_meta( get_current_user_id(), 'billing_custom_field', true );