fix

options/locale/locale_en-US.ini

@@ -322,7 +322,7 @@ view_it_on_footer = <a href="%[1]s">View it on %[2]s</a>.
 
 activate_account = Please activate your account
 activate_account.title = %s, please activate your account
-activate_account.body = <p>Hi <b>%[1]s</b>, thanks for registering at %[5]s!</p><br><p>Please click the following link to activate your account within <b>%[2]s</b>:</p><br><p><a href="%[3]s">%[3]s</a></p><br><p>Not working? Try copying and pasting it to your browser.</p>
+activate_account.body = <p>Hi <b>%[1]s</b>, thanks for registering at %[4]s!</p><br><p>Please click the following link to activate your account within <b>%[2]s</b>:</p><br><p><a href="%[3]s">%[3]s</a></p><br><p>Not working? Try copying and pasting it to your browser.</p>
 
 activate_email = Verify your email address
 activate_email.title = %s, please verify your e-mail address