Use proper types in app.js

internal/ui/static/js/app.js

@@ -71,9 +71,9 @@ function toggleMainMenu(event) {
     const menu = document.querySelector(".header nav ul");
     const menuToggleButton = document.querySelector(".logo");
     if (menu.classList.contains("js-menu-show")) {
-        menuToggleButton.setAttribute("aria-expanded", false);
+        menuToggleButton.setAttribute("aria-expanded", "false");
     } else {
-        menuToggleButton.setAttribute("aria-expanded", true);
+        menuToggleButton.setAttribute("aria-expanded", "true");
     }
     menu.classList.toggle("js-menu-show");
 }
@@ -274,7 +274,7 @@ function saveEntry(element, toasting) {
     request.withCallback(() => {
         element.textContent = "";
         appendIconLabel(element, element.dataset.labelDone);
-        element.dataset.completed = true;
+        element.dataset.completed = "true";
         if (toasting) {
             const iconElement = document.querySelector("template#icon-save");
             showToast(element.dataset.toastDone, iconElement);