Merge 'origin/master'

CHANGELOG.rst

...pps/alsijil/frontend/components/coursebook/Coursebook.vue

.../components/coursebook/absences/AbsenceCreationDialog.vue

...nd/components/coursebook/absences/AbsenceCreationForm.vue

...d/components/coursebook/absences/ManageStudentsDialog.vue

...end/components/coursebook/absences/absenceReasons.graphql

...omponents/coursebook/absences/participationStatus.graphql

...alsijil/frontend/components/coursebook/coursebook.graphql

...tend/components/coursebook/queries/absenceReasons.graphql

...frontend/components/coursebook/queries/extraMarks.graphql

...l/frontend/components/coursebook/queries/subjects.graphql

...omponents/coursebook/statistics/StatisticsForGroupTab.vue

...ponents/coursebook/statistics/StatisticsForPersonCard.vue

...ponents/coursebook/statistics/StatisticsForPersonPage.vue

...lsijil/frontend/components/coursebook/statistics/modes.js

...ntend/components/coursebook/statistics/statistics.graphql

...ijil/frontend/components/extra_marks/ExtraMarkButtons.vue

aleksis/apps/alsijil/frontend/errorCodes.js

aleksis/apps/alsijil/frontend/index.js

aleksis/apps/alsijil/managers.py