Thank you very much for being so kind to answer.
I forgot to post the result here, but I also fixed it with a batch file. (SCCM can also start batchfiles)
That batchfile is quite compact and not as nice as yours, but I will post it here any way, because maybe someone else can use it.
echo Start @ %date% %time%>>logfile.txt
cd Exceptions
ExceptionDeployer --workflow=install --mode=pre --installLanguage=sv_SE>>logfile.txt
cd..
cd Build
Setup.exe –mode=silent –action=install
cd..
cd Exceptions
ExceptionDeployer --workflow=install --mode=post --installLanguage=sv_SE>>logfile.txt
echo done @ %date% %time%>>logfile.txt
Have a nice day,
Demesmaeker