@KinkKong @European Commission honestly, using a language that is not the official language of one of the big countries of the EU (but is widely known as a second language) sounds better than giving undue advantage to the people in a country that already has a big population.
And besides, if that single language had to be chosen by number of EU speakers, I believe that German or French would come first, then Italian¹, and only then Spanish
¹ please don't! too many Italians are already self-centered assholes, they don't need to be helped gain confidence in their cultural importance this way.