I think you should have the option for British or American English and European or Latin American Spanish as well as European or Brazilian Portuguese before you start a course. In the UK where I live, it's colours not colors and grey not gray. Duolingo needs to learn British English.
New to duo lingo as I am, I love it - need the language to speak in Spain (Europe) as you would expect 'King' Spanish just as 'Queen's English' people get very sniffy about! So stop, just be thankful that the Spanish speaking will love you for trying and forgive mistakes that you make - pay for lessons if you are going to be so critical?
Mas bien, "un idioma." Lenguaje refers more to figurative language, or literally speech. El lenguaje de sus poemas es muy complicado y me cuesta entenderlo. - The language (choice of words) in his poems is very complicated and it's difficult for me to understand it. Hope that helps!