TIC 4421, closes #4421

app/controllers/calendar/calendar.php

app/controllers/calendar/schedule.php

app/controllers/course/details.php

app/views/calendar/calendar/add_courses.php

app/views/calendar/schedule/_colorpicker.php

app/views/calendar/schedule/_dialog.php

app/views/calendar/schedule/_entry_course.php

app/views/calendar/schedule/_entry_inst.php

app/views/calendar/schedule/_entry_schedule.php

app/views/calendar/schedule/_semester_chooser.php

app/views/calendar/schedule/course_info.php

app/views/calendar/schedule/entry.php

app/views/calendar/schedule/index.php

app/views/calendar/schedule/settings.php

app/views/calendar/schedule/stylesheet.php

app/views/my_courses/group_selector.php

app/views/my_courses/groups.php

db/migrations/6.0.13_alter_schedule_table.php

lib/calendar/CalendarColumn.php

lib/calendar/CalendarView.php