I was initially looking at the header title in the page, I see however that the <title></title> tag is indeed wrong. This likely happened when the page was migrated to MVC.
On the admin side we should be referring to estimates only as "estimates", a year ago some references were changed to "quotation" and then some changed back again in a moment of indecision. We want to stick to one naming convention and allow any customised naming only to be effective on the actual estimates and client area control panel.
We'll get both these issues looked at today.