There is no reason we should not get a warning when accidentally
breaking the core, is there ;)?

Improves readability by declaring that this filter is not part of the
system check, but limits the system check to a subset of apps.

lambda expressions cannot be used as field defaults because they cannot
be serialised in migrations.

Enable django sites framework

See merge request AlekSIS!162

Show announcements on dashboard

Closes #187

See merge request AlekSIS!161

# Conflicts:
#	aleksis/core/models.py

Improve announcement model

See merge request AlekSIS!160

- Add __str__
- Add verbose names
- Make description optional
- Add new default for valid_until

- Add __str__
- Add verbose names
- Make description optional
- Add new default for valid_until

https://github.com/Bouke/django-two-factor-auth/issues/335#issuecomment-584180803

Add way for dashboard widgets to add custom CSS/JS files which will be added in the html head

See merge request AlekSIS!155

Allow getting announcements for a set of objects

See merge request AlekSIS!157

Add announcement model

Closes #166

See merge request AlekSIS!156

Closes #166.

Maintain default data and implement app hooks

See merge request AlekSIS!154

Currently translated at 62.8% (98 of 156 strings)

Translation: AlekSIS/AlekSIS
Translate-URL: https://translate.edugit.org/projects/aleksis/aleksis/de/