Bug#684393: dblatex: <book lang="nn"> do not handle double quotes in at least <part> and <chapter> title

Package: dblatex
Version: 0.3-2

I mentioned in BTS report #682936 that using <book lang="nn"> caused
these errors when trying to build the PDF:

freeculture.nb.tex:833: Use of \HyPsd <at> RemoveMask doesn't match its definition.
freeculture.nb.tex:833: leading text: \chapter{"Piratvirksomhet"}
freeculture.nb.tex:833: Undefined control sequence \HyPsd <at> End.
freeculture.nb.tex:833: leading text: \chapter{"Piratvirksomhet"}
freeculture.nb.tex:833: Paragraph ended before \HyPsd <at> RemoveBraces was complete.
freeculture.nb.tex:833: leading text: \chapter{"Piratvirksomhet"}
freeculture.nb.tex:833: Extra }, or forgotten \endgroup.
freeculture.nb.tex:833: leading text: \chapter{"Piratvirksomhet"}
freeculture.nb.tex:833: Argument of \HyPsd <at> CheckCatcodes has an extra }.
freeculture.nb.tex:833: leading text: \chapter{"Piratvirksomhet"}
freeculture.nb.tex:833: Paragraph ended before \HyPsd <at> CheckCatcodes was complete.
freeculture.nb.tex:833: leading text: \chapter{"Piratvirksomhet"}
freeculture.nb.tex:836: Paragraph ended before \HyPsd <at> RemoveMask was complete.
freeculture.nb.tex:853: Something's wrong--perhaps a missing \item.
freeculture.nb.tex:853: leading text: \end{quote}
freeculture.nb.tex:896: Something's wrong--perhaps a missing \item.
freeculture.nb.tex:896: leading text: \end{quote}
freeculture.nb.tex:896: Missing { inserted.
freeculture.nb.tex:896: leading text: \end{quote}

I've been able to figure out why and create an example triggering this
bug.

This docbook document demonstrate the problem: