new: implement image packages table in edit mode
refactor: fine-tune d91401a

@mebster FYI :)
fix: gather only relevant view names for modal dialogs

The other pages where not causing errors, but noise in the logs, since
the localized names where not found.
new: memorize also open subsection (inner tab) in url hash

This has the nice side-effect that when viewing i.e. the second tab of a
section and the user clicks edit, the edit page opens at the same place.
change: add a quick delay before opening a menu on mouseover

To prevent opening menus when "flying" over the screen with the mouse.