lua access to data dir by GetDataPath and made a new scripting translation system with Locale.lua as library and .lua files under Locale. Updated maps Basketball and Knockball to this new system.

foreach(dir "Fonts" "Forts" "Graphics" "Locale" "Maps" "Music" "Sounds" "Themes" "Missions" "Names" "misc" "Scripts")
  add_subdirectory(${dir})
endforeach(dir)