We recently updated from 2016.3.1028 to 2017.2.621. After this update, we noticed that while using the Bootstrap theme, icons like in the Grid are now using the Bootstrap blue color of #428bca. I confirmed this in the Grid demo that the icon colors have now all changed to blue. This looks really strange and is totally different from the previous version of the Bootstrap theme, in which icons were black. Was this an intentional change or a bug? Is there any easy way to go back to how it was?