Show decrypt error

lib/components/message_content.dart

@@ -127,6 +127,19 @@ class MessageContent extends StatelessWidget {
                 ),
               ),
             );
+          case MessageTypes.BadEncrypted:
+            return Row(
+              mainAxisSize: MainAxisSize.min,
+              children: <Widget>[
+                Icon(Icons.lock),
+                Text(
+                  event.getLocalizedBody(context),
+                  style: TextStyle(
+                    color: textColor,
+                  ),
+                ),
+              ],
+            );
           case MessageTypes.Text:
           case MessageTypes.Reply:
           case MessageTypes.Location: