Widget should show required fields or customize error message.

When entering a comment from the widget, the end user is prompted to "Sum it up with a short title" but it's not intuitively marked as a required field. When the user submits with this field empty, an error is thrown but the error message is fairly generic and doesn't tell the user that they've skipped a required field. ("There was a problem sending your feedback. Please try again.")

Possible solutions might include:
- a simple highlight or mark on the required fields
- a customized error message or one which tells the user to check his/her fields before trying again