mkarchiso: set LC_ALL instead of LANG
LC_ALL overrides LANG and all LC_* variables, so use it instead.
See https://www.gnu.org/software/gettext/manual/html_node/Locale-Environment-Variables.html#Locale-Environment-Variables.
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LC_ALL overrides LANG and all LC_* variables, so use it instead.
See https://www.gnu.org/software/gettext/manual/html_node/Locale-Environment-Variables.html#Locale-Environment-Variables.