Fix the subheader behavior in 2016 theme

Idea created by ln29505 on Jul 12, 2017
    Under review

    The default behavior of menu subheaders in the 2016 theme is problematic:

    - Bold does not provide enough distinction

    - Hovering makes the white text turn purple, implying it is a clickable link (which it is not)

    It would great if menu subheaders were larger or otherwise more distinct and the hover behavior should be removed

    Product Version (if applicable):0