Since hrev51075, locale -m changed meaning to the one expected by POSIX
(it now lists character maps, instead of giving the current language).
Since the short options may change again (locale -c is still not doing
what POSIX requires), use long options instead. This is more readable
and POSIX doesn't specify anything there so we can name them however we
want.
Fixes date parsing in Python which relies on these variables to detect
the current locale.
5f4f984a94