[BRLTTY] Major improvements to the German contraction table

[Mario Lang]

Hi.

In case you read german contracted braille, you should give the de-g2
table a second try.  I've roughly halved the estimated error rate
in the past months.  I ran a list of 2 million german words
through RTFC and am slowly, but steadily, working my way through the
differences.  I started at 140000 words which are different
between BRLTTY and TRFC, and now we only have 72000 words left to look
at.  So while it is hard to estmiate a real error rate, especially
because nobody is reading text with uniformly distributed words...
And not even translators like TRFC are free of errors...
We really made progress in the last months which should actually show in
practice.

-- 
CYa,
  ⡍⠁⠗⠊⠕