Using more than one language

Hi,

I am using aspell to check my latex files before compilation!

aspell --lang=en_gb --mode=tex -c main.tex

Now, I am working on a text that includes passages in both English and
German, but I have not found any way to run aspell with actually two
langauges like:

aspell --lang=en_gb,de_de --mode=tex -c main.tex


I could of course manually add all the German words to my .aspell.en.pws
file. But I think, this is somewhat wrong...

Isn't there another way?

Thanks,
Linus