amendment on country codes

[Clytie Siddall <clytie@riverland.net.au>]

Sorry, just noticed that some of the countries do have both two- and 
three-letter codes in the ISO-3166 files. Quite a few only have 
three-letter codes, but with luck I can match up the two-letter ones 
with the fields in the Installer. :)

from Clytie (vi-VN, team/nhóm Gnome-vi)

Clytie Siddall--Renmark, in the Riverland of South Australia

Ở thành phố Renmark, tại miền sông của Nam Úc