fromleda/text-humanizer ? reverse-engineered prompt

Build me a simple Python app that takes AI written text and rewrites it so it sounds more natural and human. I want it to keep the original meaning, support the languages listed in the README, and use the same kind of rewriting flow described there with a model based rewrite, translation in the middle, and then a final reconstruction step. If a DeepL key is present, include that extra translation step, but make it work without it too.

Please make it easy to run from the command line with a main script and a config file, and use sensible defaults so I only need to fill in my API keys and target language. It should be cleanly organized, work on Windows, Mac, and Linux, and include enough error handling that it tells me when a key or setting is missing. If you need to look up current API or library docs online, go ahead.