Remove calendar.js

static/calendar.js

-document.addEventListener("DOMContentLoaded", function () {
-    var month = document.getElementById("year_and_month");
-    if (month == null) {
-        return;
-    }
-    var date = new Date();
-    month.innerHTML =
-        "" +
-            date.toLocaleString("de-de", { month: "long" }) +
-            " " +
-            date.getFullYear();
-});