You are browsing the old Contao 3 extension repository. Contao 3 is no longer maintained as of June 2019! You can find the Contao 4 extensions on extensions.contao.org.
Extensions > changelanguage
Allow the visitor to switch between different languages of a page.
The ChangeLanguage extension allows visitors to switch between different languages of your website.
Contao itself provides multilingual support by default, you can create unlimited number of page trees in different languages on either the same or different domains. ChangeLanguage simply adds the functionality to link pages together and present the website visitor with a list of available languages.