diff --git a/django/views/i18n.py b/django/views/i18n.py
index c4be394900..d6a29eb8f9 100644
--- a/django/views/i18n.py
+++ b/django/views/i18n.py
@@ -87,14 +87,15 @@ def get_formats():
 
 js_catalog_template = r"""
 {% autoescape off %}
-(function(globals) {
-
-  var django = globals.django || (globals.django = {});
+'use strict';
+{
+  const globals = this;
+  const django = globals.django || (globals.django = {});
 
   {% if plural %}
   django.pluralidx = function(n) {
-    var v={{ plural }};
-    if (typeof(v) == 'boolean') {
+    const v = {{ plural }};
+    if (typeof v === 'boolean') {
       return v ? 1 : 0;
     } else {
       return v;
@@ -108,25 +109,25 @@ js_catalog_template = r"""
 
   django.catalog = django.catalog || {};
   {% if catalog_str %}
-  var newcatalog = {{ catalog_str }};
-  for (var key in newcatalog) {
+  const newcatalog = {{ catalog_str }};
+  for (const key in newcatalog) {
     django.catalog[key] = newcatalog[key];
   }
   {% endif %}
 
   if (!django.jsi18n_initialized) {
     django.gettext = function(msgid) {
-      var value = django.catalog[msgid];
-      if (typeof(value) == 'undefined') {
+      const value = django.catalog[msgid];
+      if (typeof value === 'undefined') {
         return msgid;
       } else {
-        return (typeof(value) == 'string') ? value : value[0];
+        return (typeof value === 'string') ? value : value[0];
       }
     };
 
     django.ngettext = function(singular, plural, count) {
-      var value = django.catalog[singular];
-      if (typeof(value) == 'undefined') {
+      const value = django.catalog[singular];
+      if (typeof value === 'undefined') {
         return (count == 1) ? singular : plural;
       } else {
         return value.constructor === Array ? value[django.pluralidx(count)] : value;
@@ -136,7 +137,7 @@ js_catalog_template = r"""
     django.gettext_noop = function(msgid) { return msgid; };
 
     django.pgettext = function(context, msgid) {
-      var value = django.gettext(context + '\x04' + msgid);
+      let value = django.gettext(context + '\x04' + msgid);
       if (value.includes('\x04')) {
         value = msgid;
       }
@@ -144,7 +145,7 @@ js_catalog_template = r"""
     };
 
     django.npgettext = function(context, singular, plural, count) {
-      var value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count);
+      let value = django.ngettext(context + '\x04' + singular, context + '\x04' + plural, count);
       if (value.includes('\x04')) {
         value = django.ngettext(singular, plural, count);
       }
@@ -165,8 +166,8 @@ js_catalog_template = r"""
     django.formats = {{ formats_str }};
 
     django.get_format = function(format_type) {
-      var value = django.formats[format_type];
-      if (typeof(value) == 'undefined') {
+      const value = django.formats[format_type];
+      if (typeof value === 'undefined') {
         return format_type;
       } else {
         return value;
@@ -185,8 +186,7 @@ js_catalog_template = r"""
 
     django.jsi18n_initialized = true;
   }
-
-}(this));
+};
 {% endautoescape %}
 """