Fonts in german not found

[Hans Fuchs <hans enova ch>]

Hi

My default LANG env is de_DE. When I start dia and put a UML Class on a 
sheet I get the message that helvetica-fett isn't found.

I have helvetica-bold on my system, so I would have the font, since fett 
is bold.

I looked for some help in the xfont programs, but I didn't find anything. 
What can I do? Where do I start to solve this problem?

I don't even know if german systems normally have german fontnames.

Best,
        Hans