Problem with translating menus.

Hi,
I'm using version 5.1 and I have a problem with my multilanguage menus.
The default language will be English, the second one you have to choice is German.
I've add a contact site with language set up to English and give it a name contact.
But, at which position I was able to translate it?
To translate the content it's not the problem, I've done that.
How I was able to translate the name of menu (en -> ge = contact -> Kontakt)
I've searched the administer menu step by step, and the database with webmin too.

If I go to Administer -> Site Configuration -> Localization I find nothing.
Isn't this the right thing to translate any menu?

I also done to export a po file, and after a handmade translation I import this file already.

Anybody can help Me?

Thanks,
Chris...