Surface world: grass in daylight, forests, cliffs with cave mouths; free-game and editor option

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/de.lang

@@ -724,6 +724,9 @@ net.ai_off = Aus
 
 # rival masters (free game)
 newgame.difficulty = Gegner
+newgame.land = Gelände
+newgame.land0 = Unterirdisch
+newgame.land1 = Halb über der Erde
 diff.0 = Leicht
 diff.1 = Mittel
 diff.2 = Schwer
@@ -1130,6 +1133,7 @@ ed.forts = Ritterfestungen
 ed.rivals = Rivalen-Meister
 ed.difficulty = Schwierigkeit
 ed.portals = Portale
+ed.surface = Oberwelt (Osten)
 ed.edit_map = Karte bearbeiten
 ed.make_random = Zur Zufallskarte machen
 ed.paint_map = Karte erzeugen und malen
@@ -1210,6 +1214,8 @@ ed.terrain.ruby = Rubinader
 ed.terrain.diamond = Diamantader
 ed.terrain.steel = Stahlwand
 ed.terrain.mushroom = Riesenpilz
+ed.terrain.grass = Gras (Oberwelt)
+ed.terrain.tree = Baum
 ed.place.core = Seelenkern
 ed.place.portal = Portal
 ed.place.gate = Heldentor