[verein.git] Fix misuse of the “babel” Teχ package:

• never(!) load either the “german” or “ngerman” package
  (nor “germanb” or “ngermanb”)
• use appropriate options for the “babel” package, correctly disabling
  shorthands and setting the default language for the whole document

Look at print/leaflet_teckids_common.tex for a deformed German example
(replace a̲l̲l̲ “ngerman” with “german” in the babel line for 1901 German)
and at print/a6.tex for an English example of correct usage.