newui: Remove dialog modal on transition
newui: Add error pages for 404 and 503 errors

These pages are rendered when the user tries to access a non-existing
route.
newui: Add error notification when an action fails

onFail function sends the action showActionFail. When this function
runs, a dialog will appear and the route will be refreshed.

All actions should implement onSuccess and onFail functions.
newui: Add view with an input and validation methods

Used for:
- Create container
- Create object
- Rename object

The view trims the value of the input and checks if:
- is empty
- has too many characters
- has slashes in it (for containers)

If the value of the input is valid so far, then the view triggers
the controller to check if the new id of the record is already
taken.