simplify entity declaration in books and articles

[Hiroki Sato]

"Simon L. Nielsen" <simon at FreeBSD.org> wrote
  in <20040807203924.GC684 at arthur.nitro.dk>:

simon> This applies without error, but when I build the a document in the ja
simon> part:

 Grr, I forgot to do "cvs add" the localized articles.ent
 and books.ent.  It should work this time...

-- 
| Hiroki SATO
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