Change the Language of just one Application

FROM : Gerriet M. Denkmann
DATE : Sat May 24 11:09:56 2008

Somewhere I have read (if my memory is not faulty) that it is 
possible to lauch an app with some arguments (or environment 
variables?) changing the preference order of languages.

E.g. my preferred language is English, but I want to test the German 
localization of some app.

Xcode allows me to set:
Command-line arguments to pass to the program upon launch
Environment variables to set before launching the program

But what to set where?

Another (related) problem: this works:
> open /Applications/TextEdit.app


But this does not:
> open /Applications/TextEdit.app -NSOpen /tmp/a

although recommended as "more commonly used command-line argument" by 
the "Runtime Configuration Guidelines" in "Using Launch Arguments".


Kind regards,

Gerriet.