translate-region bug

[Jesper Harder]

`translate-region' doesn't work correctly for multibyte characters.
For example:

(let ((table (make-string 256 ?y)))
  (setf (aref table ?a) ?≠)
  (with-temp-buffer
    (insert "abra")
    (translate-region (point-min) (point-max) table)
    (buffer-string)))

  => "\x9c\xf4ye"

It should have returned:

     "≠yy≠"

In GNU Emacs 21.3.50.63 (i686-pc-linux-gnu, GTK+ Version 2.0.2)
 of 2004-02-21 on defun.localdomain
configured using `configure '--with-gtk''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US.iso88591
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t