Translate pdf for Woocommerce pdf invoice

Since the version 3.7 of Weglot plugin, you can translate pdf generate by WooCommerce PDF Invoices & Packing Slips plugin

Since version 3.7, Weglot can translate the PDFs generated by the WooCommerce PDF Invoices & Packing Slips plugin. This is disabled by default.

To enable it:

// Add this using the "Code Snippets" plugin or directly in functions.php
add_filter( 'weglot_translate_pdf', '__return_true' );