@Artūras Šlajus https://github.com/jillesvangurp/fluent-ai
That's a fritz2 app for ai translating project fluent localization files, and it uses my fluent-kotlin library as well. So both an example of how to set up localization and a nice tool for AI generating additional translations. Bring your own API key for openai if you want to use it.
I built this last year; we are using this internally for managing thousands of localization strings.