Are you using the Google Cloud Translate API or something? AFAIK google translate is a paid API, curious how you're doing it in a free / open source app. BYOK?
I found this Rust crate rust-translate (https://github.com/Mintype/rust-translate) that seems to be a wrapper around Google Translate. I guess the Google API gives some free tier for basic usage so it works? Idk, you might want to check try it out.