In AE we never call lemonade soda pop either. I think the point is that that's the word they use for these mass-produced drinks such as Coca-cola or Pepsi Cola. It makes me wonder, however, what they call lemonade? Granted Google translate is not much of a reference, but they do say it's "limonadi."
On the American west coast we used to call these "soft drinks," but lately young people call them "sodas." I do think they used to be called "soda pops" in my parents' generation. How about in the UK?
I don't think we really have what you'd call "lemonade". There's either fruit-flavoured mass produced "limonadi" or there's juice (mehu) that you either press yourself or buy from a store. "Täysmehu" is (at least supposed to be) actual pressed fruits while "tiiviste(mehu)" is when the juice is a concentrate.
Limonaadi like I have always pronounced it and saw it written is just this "fizzy drink" in Finland too.
There is also wrong audio when it should be said limonadia (which I would still say limonaadia)
I was taught long ago in school that lemonade is actually juice that is made of lemon. :)