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This has been the case for a while (at least since 5.8?). The language code in the user agent string (and possibly elsewhere in the HTTP headers) is always 'en-US' on my machines, despite my preferred language in System Preferences being set to Australian English. Safari, on the other hand, uses 'en-au'.

This is despite having 'Request web pages in my preferred language' turned on OmniWeb's preferences.

David