This thread is resolved. Here is a description of the problem and solution.
Problem: How can I translate the texts for the fields Shop Name,Shop Address, Footer: terms & conditions, policies, etc.?
Solution: Our developers heard back from the WooCommerce PDF Invoices and Packing Slips author. He has told us that he is not going to support WPML in free version of his plugin, but he will be supporting customers who bought premium version.
This issue is not fixable without changes in his plugin's code, but here is a link to the pro version if you would like to check it out: https://wpovernight.com/downloads/woocommerce-pdf-invoices-packing-slips-professional/
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