Merge branch 'master' into 91-add-task-for-checking-plausibility-of-data

aleksis/apps/alsijil/locale/ar/LC_MESSAGES/django.po

aleksis/apps/alsijil/locale/de_DE/LC_MESSAGES/django.po

aleksis/apps/alsijil/locale/fr/LC_MESSAGES/django.po

aleksis/apps/alsijil/locale/la/LC_MESSAGES/django.po

aleksis/apps/alsijil/locale/nb_NO/LC_MESSAGES/django.po

aleksis/apps/alsijil/locale/tr_TR/LC_MESSAGES/django.po

aleksis/apps/alsijil/model_extensions.py

aleksis/apps/alsijil/preferences.py

.../alsijil/templates/alsijil/absences/register_confirm.html

...apps/alsijil/templates/alsijil/class_register/lesson.html

...apps/alsijil/templates/alsijil/class_register/person.html

...s/alsijil/templates/alsijil/class_register/week_view.html

aleksis/apps/alsijil/views.py