folder structure (po/pot) for non-kde projects

Hello KBabel team!

I'm writing some php code and would love to use your great application, though 
I can't get my project to work properly.

I have (at the moment) one core.pot but it will get company soon. I tried the 
following directory tree:

./l10n/templates/core.pot
./l10n/de_DE/core.po

In KBabel I configured my project to use the upper directory for POT files and 
the lower one for PO files (as the project should translate to german).

But I always get a error message when I try to use the catalog message. It 
says that I did not choose a valid vasis folder for PO files and that I 
should check my project configuration...

What paths should I set? What directory structure should I use?

I read in the documentation that non-KDE projects are not supported, but it 
would totally be ok for me, if I could duplicate a KDE folder structure for 
my project - just tell me how it should look like!

Thanks
-- 
Milian Wolff
http://milianw.de