What is the language of the Troubadors?
What are constructed languages?
If you’re mad-crazy about languages, visit the very cool 
site below created by William Annis.
Do you mean what the language is (Occitan/Provençal/Langue d’Oc, between French, Italian and Spanish),or who were the troubadors (travelling musicians/poets/storytellers)?
A constructed language is a language mde by humans intentionally e.g. Esperanto.
Thanks for the link; it really is quite good.