That's a EU-Rule. Read the Wikipedia-Entry about lemonade in your language.
"Clear" lemonade: In many western European countries, the term limonade, from which the term "lemonade" is derived, originally applied to unsweetened water or carbonated soda water with lemon juice added, although several versions of sugar sweetened limonade have arrived on store shelves.[...]Many varieties of lemonade exist, such as peach, raspberry, pomegranate, strawberry and cranberry.[...]"
So: Water + sugar + juice + CO2=lemonade and juice = juice (sometimes concentrated juice + water)
I don't know why you act so pissed because people have a different opinion than you o_O" I would not say Orangina is a juice and you wouldn't say it's a lemonade. Leave it like that. Maybe it's because you live in UK and we're living in Poland or Germany and here lemonade doesn't have to be made with lemons
im not sure where you got the 'pissed' part from? im spanish living in the uk and it makes no difference, lemonade is a lemon drink as far as im concerned, calling anything else lemonade doesnt make much sense to me, just causes pointless confusion in my opinion thats all. Its kind of like asking for coke and they give you pepsi, bit of a joke really dont you think?
customer= coke please..
stall owner= is pepsi ok?
customer= is foreign currency ok? didnt think so...