Improvements for Search & Replace in editor

1. worker should be able to see what was actually changed when using  "search&replace" via menü "Actions", not just the number of instances

2. a further request would be to allow undoing changes if need be without manually looking for them (similar to search/replace function in Word)

3. another useful feature would be to get an overview of all instances/segments where the term/phrase appears (similar to Word)