Change Label text of Chapter in PDF Bookmarks

[Peter Fleck <peterfleck@gmail.com>]

Hi,

I have a customization that changes the "Chapter" label to "Lesson" 
using the below:

<l:i18n xmlns:l="http://docbook.sourceforge.net/xmlns/l10n/1.0";>
    <l:l10n language="en">
        <l:gentext key="Chapter" text="Lesson" />
        <l:gentext key="chapter" text="Lesson" />
    </l:l10n>
</l:i18n>

This works fine for the content of the PDF etc. but it stays as 
"Chapter" in the PDF Bookmarks.

Is it possible to change in the PDF as well as the body?

Many thanks,

Peter