Merge branch 'release/3.0.12'

.gitlab-ci.yml

android/app/build.gradle

android/app/src/main/AndroidManifest.xml

android/app/src/main/play/contact-email.txt

android/app/src/main/play/contact-website.txt

...d/app/src/main/play/listings/en-US/graphics/icon/icon.png

lib/l10n/app_de.arb

lib/l10n/app_en.arb

lib/storage/config.dart

lib/storage/planstorage.dart

lib/storage/schoolclassstorage.dart

lib/storage/teacherstorage.dart

lib/ui/authui.dart

lib/ui/settings/mainsettings.dart

lib/utils/logger.dart

metadata/en-US/changelogs/30012.txt

pubspec.lock

pubspec.yaml

test/fetch_schoolclassstorage_test.dart

test/fetch_teacher_test.dart