Use an opt-out flow for comments in video, springify notifications and
notifications handlers

Added size filter
Refactored versions controller
Refactored titles in VFSOverviewController and LargeFilesController

additionally selected column

Allow the browser to cache the images in the page editor (new images
will get new mappers and therefore update is not an issue), don't create
new image component by settings changes but update them to allow again
the browser to use the cached images.