AnotherGuy
Hero
I was being facetious.Marvel had to cram their stories into a series of 2-to-3 hour movies. As DMs we don't face nearly that same time constraint, and thus are free to delve into details and minutae such as diversity of in-setting languages that those movies didn't have time for.
As for Marvel, they could have easily taken the approach of the 13th Warrior in the first few minutes where as they're talking Asgardian (with subtitles for the audience) it slowly develops to English (i.e. to reflect to the audience they're speaking another language)....