pop-up event details still uses silk icons

add calendar and lessons to a site. Add events of every available type to the calendar. Upload 2 attachments to one of the events In lessons, add calendar from the Add Content menu. then click on each of the events you created and make sure the FA icon is the correct one. make sure the attachment icons are also FA icons and show up correctly.  Close the pop-up and click on a calendar event without attachments.  Then click on the event with attachments and check that they are still shown. Go to the calendar tool.  Check that the correct icons are shown against the events and that the legend at the bottom is correct.  Look at the day/week/month views to see that the icons are correct. List the events and check that the icons are right. Use the preferences tool to change to English - UK and check that these event types are show: Online Test Online Discussion Conference Class Seminar Lecture Lab Session