Prototype display of saved changes in a modal

* Pop up a modal showing the paths you just edited and the success
message
* Modal doesn’t have a close button, just an “Ok” button which does the
same thing
* Uses existing messages for editing single, bulk adding, bulk editing,
bulk tagging
* Edit again is non-functional
Try highlighting and returning to paths

* Show the paths in blue if just edited. Doesn’t quite work, but
keeping them selected feels dangerous too. Green is already used to
symbolise redirect
* Scroll down to the first mapping in the selection of mappings just
edited
Use a selectable table in modal for quick editing

* In the modal, allow selection of mappings just edited for quick
changes or fixes
Clicking the background shouldn't hide modal

* In this case we don’t want users losing their saved changes by
accidental clicking