Similar to how we format language names, add a variant that
emphasizes the region part of a locale. We show the language
in parentheses as discriminator only where needed.
When there is only one locale for this language, omit the territory
and codeset from the descriptive name. This makes the parenthesized
part appear a bit more like a discriminator instead of a wierd
formatting convention.
If software with "Chhattisgarhi" translations was loaded (such
as k3b), we would fail to load the language name for it, as we
were not parsing the ISO-639-3 database.
https://bugzilla.gnome.org/show_bug.cgi?id=641373
