re #180 Updated the series list to automatically show the trakt.tv trending when there's nothing in the database and when adding shows.

When you start typing, the trending list disappears in favor of the search results.
When you empty the search box again, the trending list re-appears.

Removed some old and obsolete templates and variables
Rearranged some divs and cleaned up the template
Added documentation to all functions.
Modified some english translations where needed (Todo: dutch).