Hi, I'm having the same problem!
I'm developing a german language version of my app.
However, the yes and no buttons appear correctly when I run my App on OSX:
yes = "ja" and no = "nein"
But on Android they appear in english!!
I checked my Android tablets (Samsung Galaxy tab4 and Asus Transformer) and they are both set to german in their language settings!
Does anybody know why this is behaving differently on each OS??