o Add new translations and enable them in book.sgml:

(new) -> 1.5 boot/chapter.sgml
(new) -> 1.1 users/chapter.sgml

    Note: Remove FreeBSD's bootstrap section from
	  internals/chapter.sgml.

o Merge the following from the English version:

1.5 -> 1.8 chapters.ent

Submitted by: Hiroki Sato <hrs@geocities.co.jp>