renamed absence module

lib/state/app/modules/app_modules.dart

@@ -140,7 +140,7 @@ class AppModule {
       ),
       Modules.absenceReport: AppModule(
         Modules.absenceReport,
-        name: 'Krankmeldung',
+        name: 'Abwesenheitsmeldung',
         icon: () => Icon(Icons.sick_outlined),
         create: AbsenceReportView.new,
       ),