I had to implement multilingual UI for my app recently and the best method I found was using an LLM API inside a script which just runs on build and anytime a new text field gets added it gets the translations and stores it in a JSON where the right strings are picked based on system language or user settings. The annoying part was adjusting the entire UI to the new 'dynamic' string selection functionality but other than that, the tokens I had generated only cost maybe a dollar. I suggest the author looks into that, because waiting for user submissions could take some time

An LLM isn’t going to provide a high quality translation because it doesn’t understand the context of what the string means in the UI, cultural conventions/writing styles, etc. You might as well run every string through Google Translate. Localization isn’t just a 1-to-1 translation of the text - it requires tailoring for each language that a human translator can do best.