If you are planning a store that caters to more than one language, be sure to use the 4DBKPrefsSet command on your main Web page. This is to tell 4DBK that subsequent pages will be served from corresponding WebPagesXX folder, where XX is the country code corresponding to the language that the store is available in.
Here are a couple of examples:
This sets the Web language preference for the store to German, where the Web pages served are from the WebPagesDE folder.
This sets the Web data served by the 4D Business Kit to German as well.