[BRLTTY] The unknown-character sign (26)

[Mario Lang]

Hi.

During testing of the german contraction table, I notice a problem
with our unknown-character sign, 26 (the question mark).  26 is used
in german contracted braille as a word-contraction and as a syllable-contraction.
As a result of this, the question mark (26) is only allowed
at the end of a word.  Now, at sites like Wikipedia that use
a lot of unicode hyphens and foreign language characters, it happens
quite a lot that BRLTTY doesn't know the charcode of a character and replaces
it with 26.  However, since 26 is so ambigious in german contracted
braille, this leads to confusion.  My question is, can
we make the unknown-character representation configurable from
within contraction tables?  If no, I'd like to argue
for 12345678 as the new representation for unknown characters.

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