The invoice is displayed well. And the receipt available on the order viewing page at the link View PDF /print/pdf/commerce_order/59 is displayed with question marks. The content is in Cyrillic. How can I fix this?
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Code
I added to the file \modules\commerce_invoice\css\commerce_invoice.entityprint.css
* { font-family: 'DejaVu Sans', Helvetica, Arial, sans-serif, Courier; }
This solved the problem.