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In order for the site to include contents in multiple languages, these languages must first be added.

Navigate to /admin/settings/language and select "Add language". Add all the desired languages.

Note the warning about setting the default language. It is important that you decide this early. See the note in the discussion about translating user defined strings (at the bottom of the page).

Once you've added all the languages go to Configure and select the desire language negotiation settings. If you are not sure try "Path Prefix Only". This will allow the language to be selected by a prefix in the url.

Example: "/de/contact" sets presentation language to German based on the use of "de" within the path.