Rename "Free" periods in in Timetable

[Graham Quince]

Here's a bit of code if you don't want free periods labeled as free

<style>
    div[data-content-uuid="WIDGET_UUID"] .free .subject:before {
        content: 'Study Period \a';
        white-space: pre;
    }
    div[data-content-uuid="WIDGET_UUID"] .free .subject {
        height: 20px !important;
        overflow: hidden !important;
    }
</style>