Hi! Unless you updated from a very old version, we haven’t changed anything in this area for a long time, definitely not in the last update, so I suspect this may also be due to changes in Polylang itself?
First of all, full polylang support is (and has always been) a feature of our Professional extension, which ensures that the correct (customer/checkout) language is used in the PDF regardless of the context.
That said, some of the code for the My Account buttons was a bit outdated and I have made a small update that should make sure that this uses the correct language – this would only affect the front-end user language though! If you want to test this, you can download the development version of the plugin here: https://we.tl/t-pHQw0tYiW7
