The default dictionary is taken from the language of the book. If there isn't a dictionary, or the book doesn't set the language, the interface language will be used.
When you change the dictionary while reading a book, that is remembered for the book. That dictionary will become the default for the book.
There isn't any way to set the default dictionary using the interface. It is stored in the database on the device, so if you wanted to you could add the appropriate rows.
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