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.
