Update licencecheckout.sh

Bugfix, "date" command returns now date in English, not in German

tools/licencecheckout.sh

@@ -8,7 +8,9 @@ if [ ! -f $LMUTIL -o ! -f $MATLAB ]; then
   exit 1
 fi
 
+LANG='en_US.UTF-8'
 DATUM=$( date '+%d-%b-%Y' -d '14 days' )
+LANG='de_DE.UTF-8'
 
 cd /tmp
 cat >lizenzen.m <<EOF