UI Improvements

1) Modified some WebGUI messaging with additional information to clarify and help new users who may not be familiar with some of the features:

2) Added tooltips (hint msgs) to some WebGUI elements:
   - "Approve/Block Changelog" button
   - Enable F/W Changelog Check
   - Enable Automatic Backups
   - Enable F/W Update Notifications

Author: Martinski4GitHub