WL-3217 Rename Graduate Training on the front page
WL-3217 Comment on lack of change

This field appears to not be used anywhere significant so Matthew and I
decided not to change it. If it does pop up anywhere, it will be obvious
and easy to change.
WL-3217 Change name in popup help too
Merge pull request #129 from ox-it/WL-3217

WL-3217 Rename Graduate Training to Researcher Training