Remove severityOfTheChange warning from the widget

Removed the severity of the change warning from the widget.
The addition has been made in this commit: https://github.com/csanyiarpad/WalkHub/commit/21708c75484f7bd7b46fb379bffc527547151f0c
The icons (check and warning) are remaining in the code, because they can be useful in the future.
Can't see the corresponding changes in .css.