Edit the gallery admin on the client's website. I was surprised to find the function "Periscope Control" in javascript. The function contains three blocks of comments (literally):
- "Lift up the periscope",
- "Remove the periscope",
- "Pick up another periscope (at least visible in it)"
As it turned out, the function shows at the right times the panel with the buttons "Add", "Remove", "Save" and so on.
Someone has an original sense of humor.