Language
The panel is available in Italian, English and French (since 0.53). Whoever opens the panel for the first time sees it in their browser language, if it is one of these; otherwise in English.
Your language
On the Your account page, Language box, choose the panel language. The choice is saved in your account: it applies on every device and also to the emails you receive from the panel. Automatic uses the server default language or your browser's.
The sign-in page also has a language selector at the top: the language chosen there stays on the device and, at the first sign-in, becomes your account's.
Server default language (administrators)
Also on Your account, administrators find Server default language: the language of whoever has not chosen and of emails sent to addresses without an account. Automatic uses everyone's browser language (and Italian for emails).
What is translated
In Italian and English: the interface, this manual, the news and the emails. Some technical messages (for example the details of background operations) may stay in Italian.
In French (since 0.56): the interface, this manual, the emails, the server's error messages and the descriptions of scheduled tasks. The news are in French from 0.51; older ones are in English.