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/en.lang

@@ -725,6 +725,9 @@ net.ai_off = Off
 
 # rival masters (free game)
 newgame.difficulty = Opponents
+newgame.land = Land
+newgame.land0 = Underground
+newgame.land1 = Half above ground
 diff.0 = Easy
 diff.1 = Medium
 diff.2 = Hard
@@ -1131,6 +1134,7 @@ ed.forts = Knight fortresses
 ed.rivals = Rival masters
 ed.difficulty = Difficulty
 ed.portals = Portals
+ed.surface = Above ground (east)
 ed.edit_map = Edit the map
 ed.make_random = Make it a random map
 ed.paint_map = Generate and paint the map
@@ -1211,6 +1215,8 @@ ed.terrain.ruby = Ruby vein
 ed.terrain.diamond = Diamond vein
 ed.terrain.steel = Steel wall
 ed.terrain.mushroom = Giant mushroom
+ed.terrain.grass = Grass (above ground)
+ed.terrain.tree = Tree
 ed.place.core = Soul core
 ed.place.portal = Portal
 ed.place.gate = Hero gate