Added activity text for each activity type

Ensures some sensible text is always in webhook text data.
Also aligned some notification reporting to use centralised activity
system instead of custom success events.

For #4216

app/Entities/Controllers/ChapterController.php

@@ -191,8 +191,6 @@ class ChapterController extends Controller
             return redirect()->back();
         }
 
-        $this->showSuccessNotification(trans('entities.chapter_move_success', ['bookName' => $newBook->name]));
-
         return redirect($chapter->getUrl());
     }