Prez with a Z also tripped me up plus i also thought it it was SO not SOL. Spangram was hard to get as i was looking for it starting at an edge so i got that last.
I looked into this. The solfege notes originally come from the Latin hymn "Ut queant laxis", and in the original Latin and many romance languages it is "Sol". However, in English-speaking countries it's often shortened to "So" for ease of pronunciation.
Yeah, like you found out, Basque is a language spoken in regions of France and Spain. Interestingly, the game of jai alai came from their culture, I believe. You got the other languages right - Czech, Finnish and Thai. I ended up saying "nationality/denonym homophones".