So I want to create a sort of international US English locale with Metric/SI measurement, A4 paper size, ISO date format, etc.
From what I understand, locales are defined in
/usr/share/i18n/locales. Would I be able to put the locale in here and have it be recognized when choosing a locale? What would I name the file for this locale? Where could I find information on file format and valid values for the various settings?