tests/test-config-case.t

i18n-de: mostly update fuzzies

More helptexts have been changed into on id per paragraph. New keywords
added. hg example calls changed to :hg:`..` syntax (where changed in EN).

  $ echo '[Section]' >> $HGRCPATH
  $ echo 'KeY = Case Sensitive' >> $HGRCPATH
  $ echo 'key = lower case' >> $HGRCPATH

  $ hg showconfig Section
  Section.KeY=Case Sensitive
  Section.key=lower case