use current intllib API

node_defs.lua

@@ -1,11 +1,4 @@
--- Boilerplate to support localized strings if intllib mod is installed.
-local S
-if (minetest.get_modpath("intllib")) then
-  dofile(minetest.get_modpath("intllib").."/intllib.lua")
-  S = intllib.Getter(minetest.get_current_modname())
-else
-  S = function ( s ) return s end
-end
+local S = moretrees.intllib
 
 moretrees.avoidnodes = {}