add generator 'caption' property

res/layouts/pages/new_world.xml.lua

@@ -10,12 +10,7 @@ function save_state()
 end
 
 function settings.generator_name(id)
-    local prefix, name = parse_path(id)
-    if prefix == "core" then
-        return gui.str(name, "world.generators")
-    else
-        return id
-    end
+    return gui.str(id, "world.generators"):gsub("^%l", string.upper)
 end
 
 function create_world()
@@ -39,7 +34,7 @@ function on_open()
     document.generator_btn.text = string.format(
         "%s: %s", 
         gui.str("World generator", "world"), 
-        settings.generator_name(settings.generator)
+        settings.generator_name(generation.get_generators()[settings.generator])
     )
     document.name_box.text = settings.name or ''
     document.seed_box.text = settings.seed or ''