Merge branch 'feature/vue/about' into 'master'

aleksis/core/assets/components/about/About.vue

aleksis/core/assets/components/about/AboutAleksis.vue

aleksis/core/assets/components/about/InstalledAppCard.vue

aleksis/core/assets/components/about/InstalledAppsList.vue

aleksis/core/assets/components/about/installedApps.graphql

aleksis/core/assets/css/global.scss

aleksis/core/assets/index.js

aleksis/core/assets/messages.json

aleksis/core/schema/__init__.py

aleksis/core/schema/group.py

aleksis/core/schema/installed_apps.py

aleksis/core/schema/notification.py

aleksis/core/schema/person.py

aleksis/core/schema/system_properties.py

aleksis/core/templates/core/pages/about.html

aleksis/core/util/apps.py