Several bug fixes

-Added inactive tabs, tabs become inactive when there is no data
available for that tab. If the user already has a tab open when he does
a search, and there's no results for this tab in the new result set, it
will switch back to the "all" tab.

-Fixed the media type icons in the results

-Removed the "Show More" button if there's no more results available in
the current result set.

-Clicking on the thumbnail of a result will also open the item page.

-Hide the language field if there's no language in the metadata of a
result.

-Added the sorting direction option.

-Added "YEAR" sorting option.

-Moved publisher field down.