Ok, I have created level decompiler for all of you..
use input file as original level file, output will be saved in same directory where original file is.

you need to run lua.exe decompile_levels.lua path/to/level/file.lua

For people not using windows: you need to download lua-5.1.4 source codes and overwrite src/luaconf.h with file attached in archive, then just build it with "make linux".
you should then have usable lua for decompiling level files.

Warning: new version of AB does have different level files, old level files seem to crash new version, please run decompiler for new levels before editing them.