You are very welcome to contribute to this project in order to make it better.
If you find any missing distribution that you think should be added please open a Distro request.
Currently generated API docs are available. You can find the documentation here.
If you have made a code contribution feel free to open a PR and/or an issue.
Localizations are saved in /lib/i18n/ as json files. New languages can be added either directly in the appropriate json file (e.g. en.json) or via the localizations windows/mac application which provides a GUI.
As of some restrictions with fluent_ui package currently it is easier not to use the country code in the file name so instead of en_US.json just en.json.
Feel free to publish a PR :)