Remove Comment URL Box on 3.6 and change "leave a reply" to "leave a comment"

On older versions of Atahualpa I was able to remove the "website" box on the comment form with instructions I found on this forum. With 3.6 I can't find the same code to remove in the same files as before. How can remove the website box in 3.6?

I suggest adding this as a theme option. For a lot of people that aren't bloggers the website box is confusing to them. A lot of them end up putting my website in there or an email address or something like n/a, which I have to go in and edit manually.

Also in the older versions I was able to change "leave a reply" to "leave a comment". But can't find where to do it in 3.6. A lot of people think the comment box is a form to contact me and don't realise it is for public comments. With "leave a comment I get more actual comments and more people actually going to my contact page to contact me instead of trying to send me personal emails through a comment.