Checking the latest note in the changelog, this bug might have been fixed 
recently:
http://invisible-island.net/dialog/CHANGES.html#t20121230
2016/04/24
        + fix a special case in drawing shadow on a line-drawing cell where the
          alternate-character set flag was lost (report by Martin Kravec).
        + fix a regression from 2015/05/13 changes for escaping; it is
          necessary to retain backslashes within quotes to make "\Z" escapes
          work (report by Marcin Krol).

WAIT & SEE a future release of dialog (1.4 by guessing).

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https://bugs.launchpad.net/bugs/1549300

Title:
  dialog wrongly requires double backslashes (\\n, \\Z) for control
  codes in option file

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