@teuteuf Hello. I was playing Worldle today, and it says Estonian is the second most common (presumably, mother tongue) in Portugal? I spent way too much time fact checking this, and it seems likely false. While the website you use for European language data, http://languageknowledge.eu/, does show Estonian, it says its data is from Eurobarometer, which says French is the second most common mother tongue in Portugal. I am emailing the webmaster for the website, but I figure I'd let you know too.