[AUCTeX] Teach AUCTeX "austrian" and "naustrian"

[Marcel J.]

Hi!

I'm new to Emacs and AUCTeX, still I'm getting along quite well.

But there is one issue I can't solve on my own:

As I live in Austria, I'd like to use
\usepackage[naustrian]{babel}
most of the time (Austrian German is slightly different to German spoken 
in Germany).

However, it seems like my AUCTeX doesn't respond to [naustrian] - double 
quotes are shown as ' '.
It works with [ngerman].

How can I teach AUCTeX to use [naustrian]?

Thank you!