Fix typo in nis files

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7176 8aca7d54-2c30-db11-9de9-000461428c89
back to nightly

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@7177 8aca7d54-2c30-db11-9de9-000461428c89