[Typo3] Meta tag corresponding to language setting

[Robert Markula]

I want the language meta tag in the header to reflect the currently set 
language of the page. So if the page is in french, I want the meta tags 
to be:
<meta http-equiv="content-language" content="fr-FR" />
<meta name="language" content="fr-FR" />

If there is a german translation of the page, I want this translation to be:
<meta http-equiv="content-language" content="de-DE" />
<meta name="language" content="de-DE" />

How can I do this?

Best Regards,
Ro