Is this Castellano or Español to be translated?
to clarify my silliness:
,"In Spain and in some other parts of the Spanish-speaking world, Spanish is called castellano (Castilian) as well as español (Spanish), that is, the language of the region of Castile, contrasting it with other languages spoken in Spain such as Galician, Basque, and Catalan. Speakers of these regional languages prefer the term castellano, as they consider their own languages equally "Spanish".
Careful...them's fighting words. If you're in Barcelona say "Castellano" if in Madrid "Español." Similarly in Barcelona speak of the fútbol greatness of Messi, in Madrid remark how nicely tanned Ronaldo is. ...then learn Catalan, so you'll understand when I say, ¡Visca Barça!
Good question. Complex question, as you can see in this article: http://en.wikipedia.org/wiki/Spanish_dialects_and_varieties I don't know what Duolingo's plans on the issue are, but my guess is the Duolingo community will lean vaguely towards Latin American Spanish.