I wrote Robo Translator in about 3 weeks time. I was able to achieve this by reusing code from my other SaaS projects and build on top of that quickly. Robo Translator uses ChatGPT and Azure APIs which do most of the work. I'm currently using it for translating my own language files but it works great as a tool for auto-translating subtitles to YouTube videos and for automatic speech synthesis based on those subtitles.