I had the same problem and according to the netflix support the player will always pick the language of the country where the pc is located.What about toogling Audio/Subtitles? (Kids only understand danish for now )
In my case the pc will recognize that I am in Germany and play everything in german (if available as audiostream).
As for now there are no hotkeys for changing the audio stream but he (support guy)
forwarded my suggestion and maybe they will implement that anytime...