German
Latin
Hindi
Some songs they have sung are: California 37 To be loved Drive by All American Girl...
Performers sing Latin American or Spanish American pop music. The music must be sung in Spanish, even by Brazilian contestants whose native language is Portuguese.
"Vere dignum" is sung in Latin, a classical language commonly used in traditional and religious music. The phrase translates to "truly worthy" in English.
The translation from Latin to English does not always work out correctly. Faure's works can be sung in English, but the music flows much better when sung in Latin. Some publishers will include the English words below the Latin, but not all of them do.
It's in Latin.
I've read many answers to this, including Latin, Greek, Hebrew and many more. It isn't written in any formal language. The singer - Lisa Gerrard (not Enya as many think) sings many of her songs in her own made up language
Nepali itself is a language, spoken by at least 17 million people living in Nepal. Actually "Nepali" is the official language in that area. So by the end of the day "Nepali songs" are sung in "Nepali".
Troubadours would sing about chivalrous knights, and their daring deeds.
Your question is too general to provide an exact answer. However in times past the language of religion was "Latin" and it is likely that if by "sacred music" you mean sung chants, then these would be in Latin.
Spanish. English songs are also popular among many segments of the population.