If you had a billing issue like a pending charge or a outstanding balance that wasn't paid then it won't allow you to choose "None" you'll have to update to another credit card or use an itunes gift card in order to fix that first then try choosing None afterwards.
Not sure if this article is the correct one or not also:
iTunes: Changing the display language
if you created the appleID before using it in iTunes then it will always ask for a credit card, there's no way around that.
check out this article for more help on what you are trying to do:
Create an iTunes App Store account without a credit card