Bug 10008 - Serials search results 'Opened' tab should be 'Open'

Bug 10008 - Serials search results 'Opened' tab should be 'Open'

The searials search results "Opened" tab should be labeled "Open." This
patch makes this correction and changes the wording in another place
which used "opened." Markup has also been added to maintain consistency
in display of messages.

To test, perform a search for a subscription. If your search returns
results you should see an "Open" and a "Closed" tab. To test other
affected changes perform searches which return no results, only open
subscriptions, or only closed subscriptions. "No results" messages
should display correctly and consistently.

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>