Confirm deletion of certificate

src/freedombone-sec

         return
     fi
 
-    ${PROJECT_NAME}-addcert -r $delete_domain
+    dialog --title $"Delete a Let's Encrypt certificate" \
+           --backtitle $"Freedombone Security Settings" \
+           --defaultno \
+           --yesno $"\nConfirm deletion of the TLS certificate for $delete_domain ?" 7 60
+    sel=$?
+    case $sel in
+        0) ${PROJECT_NAME}-addcert -r $delete_domain;;
+        255) exit 0;;
+    esac
 
     exit 0
 }