I looked at that thread, but could not find anything relevant, as I did not need to change my default language, which was still English. However, after some trial and error I found a solution. In my browser I had one tab in Spanish, where I wanted to make a purchase. I opened another tab to the Paypal home page, logged in as usual and that was in English. I then went back to the first tab and refreshed the screen, it at once turned into English.
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