Tuturuuu will automatically detect your browser’s language and set the language accordingly. If you want to change the language, you can do so by clicking on the language switcher in your profile avatar (located at the top right corner of the page).
The language switcher is only available after you have logged in.
If you want to help us translate Tuturuuu into your language, feel free to open a pull request on our GitHub repository that contains the translation files for the language you want to contribute (e.g., apps/web/locales/en/*.json for English).