Hey Naor

If you use a Snippet as Nicole says you're correct it will put the emails in draft BUT you can republish them in one swoop from the Design Studio.

Simply go to Design Studio, click the Email Tab and it will show all your emails in the main window.

Sort by Approved and select the ones you want to republish and right click Approve.

Of course be careful not to publish anything someone is working on but if you changed the snippet on say 1st Feb the main window will display which date the email was changed (in this case 1st Feb).

HTH