“Billing address” Not shown in Polish

Hi @bartskol,

Sure that is certainly possible. To add ‘Seller: ‘ to your shop name you can use the following code snippet:

add_filter( 'wpo_wcpdf_shop_name_settings_text', 'wpo_wcpdf_shop_name_settings_text', 10, 3 );
function wpo_wcpdf_shop_name_settings_text( $shop_name, $document ) {
	if ( $document->type == 'invoice' ) {
		$shop_name = 'Seller: ' . $shop_name;
	}
	return $shop_name;
}

To add ‘Billing address’ and ‘Buyer: ‘ to the billing address you can use the following code snippet:

add_action( 'wpo_wcpdf_before_billing_address', 'wpo_wcpdf_before_billing_address', 10, 2 );
function wpo_wcpdf_before_billing_address( $template_type, $order ) {
	if ( $template_type == 'invoice' ) {
		printf( '<h3>%s</h3>', __( 'Billing Address', 'woocommerce-pdf-invoices-packing-slips' ) );
		printf( '<p>%s</p>', __( 'Buyer:', 'woocommerce-pdf-invoices-packing-slips' ) );
	}
}

These code snippets should be placed in the functions.php of your child theme. If you haven’t worked with code snippets or functions.php before please read this: How to use filters

To create a custom translation for the ‘Invoice date:’ label please read this: Using custom translations

Hi Kluver!
Thank you very much, this indeed was very easy and straight forward and my problem is now solved.
Thank you.