This does exist, there are a few translation-as-a-service companies that offer more or less what you want. It's not exactly as you are describing, but I have a

This does exist, there are a few translation-as-a-service companies that offer more or less what you want. It's not exactly as you are describing, but I have a pipeline setup for an app I built that will extract and machine translate strings at build time. It would be pretty trivial to just do the extraction part and send off the files to whatever endpoint you want (being a human or a machine translating in the end), if you wanted to "roll your own".