Bring back "Refresh Grid Info" button in grid manager.

If you clicked on 'Add' and then filled in the fields that say
'<required>'.. and then click on OK... Then all the URL's stay blank and
there is no way to fix that anymore (short of deleting the entry first
and NOT filling in the required name?!).

I added the button back to get the URL, at any time. Much more clear.
While at it, I added some tool tips and renamed 'Add' to 'Create'
because it confused the hell out of me to have a grid selected and then
needing to press 'Add' below that.. as if you add something to the
selected grid (Better would be to have the Add button above the
selector, or even be part of the selector drop down).