To streamline this process, I developed a simple web application. Alternatively, one could manually refine the translations. The prompt is also customizable, allowing for more specific instructions. For instance, you can specify that certain words should be translated according to a provided dictionary.
Considering the cost of translation (approximately $1 for the GPT-4 model per movie), each user utilizes their own API token. The app makes requests directly to OpenAI, ensuring it's safe to share your token. This approach allows users to manage their expenses while benefiting from the advanced translation capabilities of GPT-4.
Source code is at https://github.com/afiodorov/subsgpt