in code/client/static/js/main.js [146:157]
function updateHandler(e){
let id = e.target.id.replace("update_", "")
if (id == ""){
id = e.target.parentElement.id.replace("update_", "")
}
let replacement = newTrainer(id)
let original = orig.get(id)
updateTrainer(original, replacement)
}