The language in which you view your control panel is set through your email account at your domain. If you change the language setting in your email account, your control panel will also change. This way each administrator can view the control panel in his/her preferred language.
The Next generation version of the control panel is available in US English only.
To update the language preferences in your control panel and email account:
Log in to your email account at http://mail.google.com/a/your-domain-name.
Click Settings.
Select a language from the Email display language drop-down menu in the Language section.
Click Save Changes.
Remember, your account's display language doesn't affect the language in which your messages are sent and received.
Click Manage this domain or log in at https://www.google.com/a/your-domain-name to access your control panel in the language you selected.
The available languages for other Google products may vary. Click the product below for a list of available languages: