{
var topbar=document.querySelector(".notion-topbar > div");
var element=document.createElement("a");
element.innerHTML="日本語";
element.href="https://gamepad.shaksgame.com/ja";
element.className="japanese-button";
element.setAttribute("role", "button");
element.tabIndex=0;
element.style="text-decoration: none; padding: 0px 8px; color: inherit;";
topbar.append(element);
})
-->