[PATCH] Use Unicode code points for country_isbn

[Paul Eggert]

Carlos O'Donell wrote:
> Joseph, Ondrej, and myself agree that we should find a way to just make
> these files UTF-8. I expect that a precondition is going to be to add
> an unremovable C.UTF-8 locale, which I think is important.

I also like the idea of having these files be UTF-8.

Why is an unremovable C.UTF-8 locale a precondition, though?  We should be able 
to assume a properly-installed localedef and a minimum set of locales for 
running development tools like localedef.  The minimum set could include 
en_US.UTF-8.