replace template literal and arrow function

lib/views/modal/create_page.html

@@ -78,13 +78,13 @@
       pagePath = pagePath.slice(0, -1);
   };
 
-  $.get(`/_api/pages.templates?path=${pagePath}`)
-    .then(templateInfo => {
-      buttonTextChildren = templateInfo.childrenTemplateExists ? `{{ t('Edit') }}` : `{{ t('Create') }}`;
-      buttonTextDecendants = templateInfo.decendantsTemplateExists ? `{{ t('Edit') }}` : `{{ t('Create') }}`;
+  $.get('/_api/pages.templates?path=' + pagePath)   // don't use template literal(`...${}`) for IE11
+    .then(function(templateInfo) {                  // don't use arrow function for IE11
+      buttonTextChildren = templateInfo.childrenTemplateExists ? '{{ t("Edit") }}' : '{{ t("Create") }}';
+      buttonTextDecendants = templateInfo.decendantsTemplateExists ? '{{ t("Edit") }}' : '{{ t("Create") }}';
     });
 
-  $("#template-type").on("change", () => {
+  $("#template-type").on("change", function() {
     // enable button
     $('#link-to-template').removeClass("disabled");
 

lib/views/modal/shortcuts.html

@@ -67,7 +67,7 @@
     var platform = navigator.platform.toLowerCase();
     var isMac = (platform.indexOf('mac') > -1);
 
-    document.querySelectorAll('#shortcuts-modal .cmd-key').forEach((element) => {
+    document.querySelectorAll('#shortcuts-modal .cmd-key').forEach(function(element) {
       if (isMac) {
         element.classList.add('mac');
       }

lib/views/widget/system-version.html

@@ -13,7 +13,7 @@
   var platform = navigator.platform.toLowerCase();
   var isMac = (platform.indexOf('mac') > -1);
 
-  document.querySelectorAll('.system-version .cmd-key').forEach((element) => {
+  document.querySelectorAll('.system-version .cmd-key').forEach(function(element) {
     if (isMac) {
       element.classList.add('mac');
     }