The ISO 30112 standard defines the valid values for the category
keyword as only a few options:
posix:1993
i18n:2004
i18n:2012
The vast majority of locales had changed the "i18n" string to the
name of its own locale (e.g. "ak_GH:2013") as well as tweaking the
date (presumably thinking it should be the date of submission).
Convert all of them to "i18n:2012" for consistency. A follow up
change will update localedef to actually check/validate the field.
There are only two measurement systems that locales use: US and metric.
For the former, move to copying the en_US locale, while for the latter,
move to copying the i18n locale. This lets us clean up all the stray
comments like FIXME.
There should be no functional differences here.
There's no real value in populating this field when it's the same as the
default POSIX setting, so drop it from most locales so it's clear what's
going on.
