It's a continent with lots of different countries and ethnic groups.
What is a person called who can speak more than one language?
More people speak Mandarin than any other language. More places speak English than any other language.
who?
You are bilingual if you can speak more than one language.
If you speak two languages, you are bilingual, if you speak three you are trilingual, and so forth. Polyglot
You can't speak sign language but you can "sign".
If you can only speak one language that's fine because it suits the environment that you live in but if you speak more than one language that's even better because you can speak to foreign people and will be able to speak a particular language when you go to a different country.
The official language of Romania is the Romanian language (mother language for more than 90 % of the inhabitants).
More than 90% speak Spanish as either a first or second language.
Chinese has second greatest number of people who speak it, after English. (Note: While more people speak Chinese primarily than those who primarily speak English, more have English as a primary or secondary language than have Chinese as a primary or secondary language.)
Actually most people in Europe, not just Switzerland, speak more than one language, in fact most countries in the world are that way. America is the weird one in that most Americans speak only one language.
Multiple, as in you speak more than one language