Need to rename some titles/links / #6781

In the menu navigation, I'd like to change some of the link titles to better suit my purpose/usage - keeping the functionality the same, for example:

"Files" to "Proofs"
"Changes" to "Summary"

etc... What file(s) control the titles for the navigation?

Also, how can I "hide" or remove some tabs I don't need like "Versions".

Thanks!