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Instead of using
setlocale(LC_CTYPE, "en_US.utf8")
and thus forcing "en_US" wenow use
setlocale(LC_CTYPE, "")
which configures the program to use the defaultlocale's character set instead of defaulting to the uber-portable "C" or "POSIX"
locales. (see "man 3 setlocale").
On a sane system this will use UTF-8, we do not care about insane systems.
The main advantage of this change is that it allows to use docker containers
without running "locale-gen" in the container thus making the image smaller
(~150 MB instead of ~220 MB using a Ubuntu 18.04 base)