I converted some German-language ePub files to MOBI, using calibre, in order to read them on my Kindle. The problem is, when reading the resulting file, the Kindle only looks up words in the English dictionary, not the German-English dictionary like it does with all other German books.
Does anyone know of a tool for editing .mobi metadata? I'd prefer a solution for OS X, but I'd be happy with anything that works. I'd also happily use a hex editor, if anyone knows which bits I need to frob.