Please have a look to the contributing guidelines.
Lstu comes with English, French, Occitan and Breton languages. It will choose the language to display with the browser's settings.
If you want to add more languages, please help on https://weblate.framasoft.org/projects/lstu.
There are just a few sentences, so it will be quick to translate.
If you add sentences to translate, just do
make locales to update the pot file.
Go back to wiki's homepage.