Hide unfinished features in release mode

lib/view/pages/files/fileElement.dart

@@ -168,7 +168,7 @@ class _FileElementState extends State<FileElement> {
                 },
               ),
               Visibility(
-                visible: kReleaseMode,
+                visible: !kReleaseMode,
                 child: ListTile(
                   leading: const Icon(Icons.share_outlined),
                   title: const Text("Teilen"),

lib/view/pages/timetable/appointmentDetails.dart

@@ -75,7 +75,7 @@ class AppointmentDetails {
                 leading: const Icon(Icons.person),
                 title: Text("Lehrkraft: (${timetableData.te[0].name}) ${timetableData.te[0].longname}"),
                 trailing: Visibility(
-                  visible: kReleaseMode,
+                  visible: !kReleaseMode,
                   child: IconButton(
                     icon: const Icon(Icons.textsms_outlined),
                     onPressed: () {