just found out how to change language in cs4 in osx 10.6.2:
Rightclick ae app and go to: Resources/AMTLanguages/
there should be a txt file like de_DE.txt
Doubleclick on this
there is some content like de_DE
change the content to en_US
Save this as en_US.txt at the same place (ae.app/Resources/AMTLanguages/)
delete the de_DE.txt ore store it somewhere
ae starts in english now.
bashi