I have installed Multisite to manage two domains (one

Hello,

I have installed Multisite to manage two domains (one an English version, the other a Portuguese).

My question is how do I edit the theme so that each site displays an appropriate flag indicating that the other language is available by clicking it.

Ex. Right now the flag is located in the body of the main page http://aterapia.com/ however, we would like to place it in the menu bar area to the right.

The only way I could think to do this would be to edit the header.php file, however because it is a Multisite installation, I cannot edit the header of each domain.

Thanks!