In the .OPF file, there is, in the <metadata>
Then in the <x-metadata> there is
Now to make a translation dictionary, from some other language to english, it is pretty clear I need to change the DictionaryInLanguage, but what should the <dc:Language> be set to? The source language, or English?
I think I've tried both, but still, I can't get the Kindle to look up words using my generated dictionary. So what else could be going wrong? The dictionary displays fine when I browse it.