FIX: height of language selection window

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6350 8aca7d54-2c30-db11-9de9-000461428c89
FIX: do not show placeholder image for if house tile has no image

git-svn-id: svn://tron.homeunix.org/simutrans/simutrans/trunk@6351 8aca7d54-2c30-db11-9de9-000461428c89