Hi Taco,
instead of  writing a FixMe-module I just started to make my exam-module 
from 2003 a bit more international.

As a first test I set up some commands in german and english
see file p-testDE.tex

running texexec test1.tex  the output is ok
but
running texexec --mode=english test1.tex
I get an error:
system          : module testDE loaded
(./p-testde.tex)
! Undefined control sequence.
<argument> ...st it} \subject {FixMe} \SchoolYear
                                                  {2006/07} \question 
test i...

\firstofoneargument #1->#1
                          
l.53 }

What is going wrong with my command-definations? I have no idea!

What did I fail to do?

Cheers,
Bernd