These are generated, and can be customized as described here:
http://www.sagehill.net/docbookxsl/CustomGentext.htmlFind the l:gentext elements such as "ListofFigures" to customize those
items.
For the chapters, it already does that, if you look in common/ja.xml. That
is, for all contexts except one: xref-number-and-title. I think that is
just an omission.
Bob Stayton
Sagehill Enterprises
DocBook Consulting
bobs@sagehill.net