.
I've been working on a tool to assist me in replacing and adding files to an existing .lvl file (LVLTool on my github).
But it is still buggy.
In testing, I added some strings to the the English localization file and the game booted and ran most levels, some maps now crash on loading.
I think I've got an incorrect size somewhere, but haven't yet gotten back to fix it. But will get back to it eventually. Keep looking back to Gametoast's 'Released assets' thread for a posting for the new tool.