I am living in Denmark, but using photo stream to share photos with many international contacts.Language is set to English on my iPhone, but the invitation that system is sending is in Danish.
I am wondering where to change?
Try this: https://discussions.apple.com/message/19100650#19100650
Basically go to https://appleid.apple.com and set your language preference there. I have no idea how mine was set to Portuguese!
Very annoying that this answer is hard to find.
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