Click on the Group settings link in the right hand menu.
Click on the Advanced tab to show the settings.
Use the pull down menu and select your Primary language.
You can choose to display messages with a fixed-width font.
You can Delete your group using the Delete Group button. This is permanent and cannot be undone.
If this is enabled, then any new messages sent to the group will only be sent out to the group, and won't be available on the web.
If this is enabled, then new messages will be rejected. Old messages will remain browseable and searchable.
If this is enabled, Google may occasionally email the group managers with updates about features, ask for input on new features, or seek permission to highlight the group.
Click on the Save Changes button to save any changes you make.