diff -u b/core/modules/system/js/system.modules.es6.js b/core/modules/system/js/system.modules.es6.js
--- b/core/modules/system/js/system.modules.es6.js
+++ b/core/modules/system/js/system.modules.es6.js
@@ -68,9 +68,9 @@
 
           Drupal.announce(
             Drupal.formatPlural(
-            $rowsAndDetails.find('tbody tr:visible').length,
-            '1 module is available in the modified list.',
-            '@count modules are available in the modified list.'
+              $rowsAndDetails.find('tbody tr:visible').length,
+              '1 module is available in the modified list.',
+              '@count modules are available in the modified list.'
             ),
           );
         } else if (searching) {
diff -u b/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php b/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php
--- b/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php
+++ b/core/modules/system/tests/src/FunctionalJavascript/ModuleFilterTest.php
@@ -29,7 +29,7 @@
   }
 
   /**
-   * Tests that filter results announcement has correct pluralisation.
+   * Tests that filter results announcement has correct pluralization.
    */
   public function testModuleFilter() {