base patch for review: NSLanguages system languages

[Eric Wasylishen]

Hi,
I was experimenting with changing my system language (Ubuntu 10.10) and ran in 
to a problem: I set the language in Ubuntu's language settings tool to Canadian 
French but was not getting any French translations showing up in GNUstep apps.

I didn't touch the NSLanguages user default, but when I tried reading it in an 
application, it returned ("CanadianFrench", "English").

The following patch fixes this problem by expanding regional locales into their 
more general variants - so "CanadianFrench" is expanded to ("CanadianFrench", 
"French") Also, it adds support for reading the LANGUAGE environment variable, 
a GNU extension, which lets you specify a list of locales like "de:fr_CA:en" if 
you wanted to see German, then Canadian French, then English in order of 
preference. In other words, it has the same role as the GNUstep LANGUAGES 
environment variable, but it's used by GNU gettext/gtk/probably others. 
According to the gettext docs, if LANGUAGE is set it is supposed to take 
precedence over LC_MESSAGES and LANG.

Languages5.diff
Description: Binary data

Cheers,
Eric