Bug 1737581: Disable copy collection button after first click
To stop user clicking the button multiple times thinking it didn't
work the first time. This is via the 'Copy' button within the
collection.
Also fix up the changing of button to 'processing ...' and showing the
spinner when copying collection/page on 'Copy page or collection' page
behatnotneeded
Change-Id: I4188abded7135f6722c679114b8299a92dfbf2aa
Signed-off-by:
Robert Lyon <robertl@catalyst.net.nz>