Updated German translation

git-svn-id: http://svn.montala.net/svn/resourcespace@4285 c08608d7-6e46-0410-86ca-f2a6f1370df5
Added the latest additions to the existing Swedish language files (complete).
Added a Swedish language file (complete) to the action_dates plugin.
Added a Swedish language file (complete) to the imagestream plugin.


git-svn-id: http://svn.montala.net/svn/resourcespace@4286 c08608d7-6e46-0410-86ca-f2a6f1370df5
Optimised update_field() when dealing with new records with no existing data.
Added !nopreview special search to return resources with no preview images.


git-svn-id: http://svn.montala.net/svn/resourcespace@4287 c08608d7-6e46-0410-86ca-f2a6f1370df5