While I think of it...
With firmware 4.13.12638 have changed how they handle the language in books. Before, they were generally using the three character code. Now, it is basically bcp47 (two characters for the language, then more for the locale and other things). This is what calibre sets in the book when updating the. This means that the extended drivers option to set the language is actually going to break things now. There is discussion of this in 4.13.12638 about it.
Also, the KoboTouch driver is updating the language in the database as part of the metadata update. This also had to change for 4.13.12638 and is in calibre version 3.41. That might make the option in the extended unnecessary.
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