[Typo3] Language selection not displayed on multi language site

[Heckmaenner Webmaster]

I am trying to add multi language capabilities to my website. I have succeeded so far by adding an alternative page language and I was offered a language selection in the backend to translate all my content elements. I have translated the content of my start page and on page on subsequent level. However, there is no language selector menu in the bottom of the page displayed. According to the documention, I understand it should automatically appear. Can anyone shed some light on this? Do I have to change anything in the template or the TS setup?

Thanks,
Andreas