Update substitutions print templates for calendar

aleksis/apps/chronos/templates/chronos/partials/group.html

aleksis/apps/chronos/templates/chronos/partials/groups.html

.../apps/chronos/templates/chronos/partials/groups_part.html

...is/apps/chronos/templates/chronos/partials/headerbox.html

aleksis/apps/chronos/templates/chronos/partials/rooms.html

aleksis/apps/chronos/templates/chronos/partials/subject.html

...s/apps/chronos/templates/chronos/partials/subs/badge.html

.../apps/chronos/templates/chronos/partials/subs/colour.html

.../apps/chronos/templates/chronos/partials/subs/period.html

...apps/chronos/templates/chronos/partials/subs/subject.html

...sis/apps/chronos/templates/chronos/partials/teachers.html

...s/apps/chronos/templates/chronos/substitutions_print.html