Fix focus reset after deleting a relation
Use ngAria for WP empty attribute toggling
Use ngAria for WP relation feature
Use ngAria for query selection title
Re-use focus helper for inplace editor
Use ngAria for inplace editing controls
Mention the WP attribute in the edit activation title
Use ngAria for watcher controls

Please note that this commit could not be tested because watchers are
working ATM on this branch. But this is already fixed on the main
development branch.
Adapt inplace editor to ngAria usage
Adapt query filter tests to ngAria usage
Adapt inplace edit integration test to ngAria
Fix code convention issues