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Right click your B&W launch icon and select "open file location". This takes you to your B&W install folder. Find the folder called Profiles. Inside is a folder named with your "God name". Inside that will be everything relating to that playthrough. Even screenshots your creature chooses to take.
Mine looks like this: C:\Program Files (x86)\Lionhead Studios Ltd\Black & White\Profiles\_N_y_m
In regards to migrating one language to another, you'd just have to test that one out. Never tried before.