In case the language switcher does not appear, you can try the following: Enable at least 2 languages, and then edit language negotiation.
You can find this at Home » Administer » Site configuration » Languages » Configure
Choose "Path prefix with language fallback"
Cheers Frank
More information about formatting options
English
Deutsch
Español
Language switcher does not always appear
In case the language switcher does not appear, you can try the following:
Enable at least 2 languages, and then edit language negotiation.
You can find this at Home » Administer » Site configuration » Languages » Configure
Choose "Path prefix with language fallback"
Cheers
Frank