I wrote an app that takes all localized strings in an Xcode project, turns it into a json, batch translates it with the OpenAI API, validates the json, and then converts it back into a .xcstrings file that you can drop into your project. I was writing an app that I wanted to translate into X different languages, of which I only spoke a couple and not perfectly, and this was the solution. It turned out pretty good.

I've considered putting a little bit more elbow grease and turning into a packaged product but I'm not sure if there's demand for it out there.