You could always contact Adobe Customer Service and ask that question. I'm almost certain that in a case like yours, there's a good answer, one you will like.
Not sure about the Mac side of things, though. For all intents and purposes, your serial dictates the install language and license and this may not work, after all.
The following actions works for me:
- open a terminal
- cd Documents (command pwd should show somethings like: /Users/yourUsername/Documents
- touch ae_force_english.txt (creates an empty file in your document folder)
- start application (should be english now)
Mac OS X 10.6 Snow Leopard
Production Premium CS5 (german license)
possible next steps:
small shell script which switch the language between german and english for all Premium Apps.