Is there an option on renpy to only translate script not the whole VN? I haven't test latest build.
To be honest, no one has requested this feature before, so the tool currently translates everything it can find by default (menus, user interface, scripts, etc.). I really like this idea though! I'll add it to my to-do list.
That said, implementing this without breaking the current filter system might be a bit tricky. Additionally, I'm currently developing two new tools and maintaining a live one, so my roadmap is quite busy. Therefore, it might take some time for this feature to arrive, but I will definitely work on it.