Fix myoverview block in clean theme

Make sure you're using the clean theme Create a few courses, some currently in progress, some in the past, and some in the future Enrol a student in the courses Create a couple of assignments with due dates Log in as the student View the overview block in your dashboard Click through the different sections and make sure the styling doesn't look broken (e.g. elements overflowing, misaligned text etc) Note that it should look roughly the same as it does on boost but won't be exactly the same, due to differences between bootstrap 2 and 4. Most notably the different media breakpoints. Change the resolution of the screen and confirm the styling looks generally ok (you can check out the bootstrap 2 documentation to see which media breakpoints are available) Switch to an RTL language and confirm the styling still looks generally ok