alter plugin label text to show different message

Hi Guys -

I just signed up for your plugins and I was wondering how I would go about adding an email to the label "This content is password protected. To view it please enter your password below:" I want it to say "This content is password protected. To view it please email us and we'll email you the password" Can you update this gist with the correct code? https://gist.github.com/charlieussery/6037323