they use sigh laguage and they make up laguage.
yes, you can go to uni and get a degree in a laguage, that is what laguage teachers at school do.
Chinese.
british
Telugu
Polish.
Dzongkha. But they also speak English.
Hawaiian language
Two official languages: English and French
Probably English or Arabic
language
It depends what laguage. There are a lot of languages in Africa.