Update media_tree/admin/filenode_admin.py

Replace '\\' to '/' in urls.
Update media_tree/static/media_tree/css/ui.css

Make the "Upload a file" button look normal.
Added norwegian language
Use sekizai_tags for all javascript code in templates.

This is a MUST when using django-cms.
Fix the slideshow and gallery plugins for djangocms

They must import the jquery.cycle.js and also set width to display
correct when the width of their parent span is less than the width of
the image.
Added more translated text to norwegian.
Merge pull request #19 from erlenddalen/master

Added norwegian language + some minor improvements