Removed duplicates

templates/activation_email.txt

-Someone, hopefully you, signed up for an account for MITx's on-line
-offering of 6.002 using this email address. If it was you, and you'd
-like to activate and use your account, copy and paste this address
-into your web browser's address bar:
-
-http://${ site }/activate/${ key }
-
-If you didn't request this, you don't need to do anything; you won't
-receive any more email from us. Please do not reply to this e-mail; if
-you require assistance, check the help section of the MITx web site.

templates/activation_email_subject.txt

-Your account for MITx's on-line 6.002