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First, you need a Linux distro with a functional UTF-8 locale (i.e. NOT CoreOS).
Execute
my_gen_locale.sh
to generate a validlocale-archive
by copying a locale from the system. It will use en_US.UTF-8, but can be changed if deemed necessary (the list of locales can be found in glibc sources: https://sourceware.org/git/?p=glibc.git;a=blob;f=localedata/SUPPORTED ). -
Now the /usr partition must be edited to install it.
Apparently this is quite discouraged by the devs, but I still don't know how to create a new CoreOS image