diff -u b/core/lib/Drupal/Core/Form/FormValidator.php b/core/lib/Drupal/Core/Form/FormValidator.php
--- b/core/lib/Drupal/Core/Form/FormValidator.php
+++ b/core/lib/Drupal/Core/Form/FormValidator.php
@@ -345,7 +345,7 @@
         $value = in_array($elements['#type'], ['checkboxes', 'tableselect']) ? array_keys($elements['#value']) : $elements['#value'];
         foreach ($value as $v) {
           if (!isset($options[$v])) {
-            $form_state->setError($elements, $this->t('An invalid choice has been detected. Please, contact the site administrator.'));
+            $form_state->setError($elements, $this->t('An invalid choice has been detected. Please contact the site administrator.'));
             $this->logger->error('Illegal choice %choice in %name element.', ['%choice' => $v, '%name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']]);
           }
         }
@@ -364,7 +364,7 @@
         $form_state->setValueForElement($elements, NULL);
       }
       elseif (!isset($options[$elements['#value']])) {
-        $form_state->setError($elements, $this->t('An invalid choice has been detected. Please, contact the site administrator.'));
+        $form_state->setError($elements, $this->t('An invalid choice has been detected. Please contact the site administrator.'));
         $this->logger->error('Illegal choice %choice in %name element.', ['%choice' => $elements['#value'], '%name' => empty($elements['#title']) ? $elements['#parents'][0] : $elements['#title']]);
       }
     }
diff -u b/core/modules/block/tests/src/FunctionalJavascript/BlockAddTest.php b/core/modules/block/tests/src/FunctionalJavascript/BlockAddTest.php
--- b/core/modules/block/tests/src/FunctionalJavascript/BlockAddTest.php
+++ b/core/modules/block/tests/src/FunctionalJavascript/BlockAddTest.php
@@ -44,7 +44,7 @@
     // Switch to a theme that doesn't contain the region selected above.
     $assert_session->selectExists('Theme')->selectOption('stark');
     $assert_session->assertWaitOnAjaxRequest();
-    $assert_session->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator..');
+    $assert_session->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator..');
     $assert_session->optionExists('Region', '- Select -');
   }
 
diff -u b/core/modules/comment/tests/src/Functional/CommentFieldsTest.php b/core/modules/comment/tests/src/Functional/CommentFieldsTest.php
--- b/core/modules/comment/tests/src/Functional/CommentFieldsTest.php
+++ b/core/modules/comment/tests/src/Functional/CommentFieldsTest.php
@@ -165,7 +165,7 @@
     $this->drupalGet('admin/config/people/accounts/fields/user.user.field_user_comment/storage');
     $this->submitForm($edit, 'Save field settings');
     // We should get an error message.
-    $this->assertSession()->pageTextContains('An invalid choice has been detected. Please, contact the site administrator.');
+    $this->assertSession()->pageTextContains('An invalid choice has been detected. Please contact the site administrator.');
 
     // Create a comment type for users.
     $bundle = CommentType::create([
@@ -183,7 +183,7 @@
     $this->drupalGet('admin/config/people/accounts/fields/user.user.field_user_comment/storage');
     $this->submitForm($edit, 'Save field settings');
     // We shouldn't get an error message.
-    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator..');
+    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator..');
   }
 
   /**
diff -u b/core/modules/system/tests/src/Functional/Form/ValidationTest.php b/core/modules/system/tests/src/Functional/Form/ValidationTest.php
--- b/core/modules/system/tests/src/Functional/Form/ValidationTest.php
+++ b/core/modules/system/tests/src/Functional/Form/ValidationTest.php
@@ -235,7 +235,7 @@
         $this->assertSession()->pageTextContains((string) $form[$key]['#form_test_required_error']);
       }
     }
-    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator.');
+    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator.');
 
     // Verify that no custom validation error appears with valid values.
     $edit = [
@@ -256,7 +256,7 @@
         $this->assertSession()->pageTextNotContains((string) $form[$key]['#form_test_required_error']);
       }
     }
-    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator.');
+    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator.');
   }
 
 }
diff -u b/core/modules/views/tests/src/Functional/Plugin/ExposedFormCheckboxesTest.php b/core/modules/views/tests/src/Functional/Plugin/ExposedFormCheckboxesTest.php
--- b/core/modules/views/tests/src/Functional/Plugin/ExposedFormCheckboxesTest.php
+++ b/core/modules/views/tests/src/Functional/Plugin/ExposedFormCheckboxesTest.php
@@ -109,7 +109,7 @@
     // checked.
     $this->clickLink('Page 2');
     $this->assertSession()->elementsCount('xpath', "//div[contains(@class, 'views-row')]", 1);
-    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator.');
+    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator.');
   }
 
   /**
@@ -158,14 +158,14 @@
     // All rows are displayed by default on the first page when no options are
     // checked.
     $this->assertSession()->elementsCount('xpath', "//div[contains(@class, 'views-row')]", 8);
-    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator.');
+    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator.');
 
     // Select one option and ensure we still have results.
     $tid = $this->terms[0]->id();
     $this->submitForm(["tid[$tid]" => $tid], 'Apply');
     // Ensure only nodes tagged with $tid are displayed.
     $this->assertSession()->elementsCount('xpath', "//div[contains(@class, 'views-row')]", 2);
-    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please, contact the site administrator.');
+    $this->assertSession()->pageTextNotContains('An invalid choice has been detected. Please contact the site administrator.');
   }
 
 }
diff -u b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
--- b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
+++ b/core/tests/Drupal/Tests/Core/Form/FormValidatorTest.php
@@ -424,7 +424,7 @@
           '#value' => 'baz',
           '#multiple' => FALSE,
         ],
-        'An invalid choice has been detected. Please, contact the site administrator.',
+        'An invalid choice has been detected. Please contact the site administrator.',
         TRUE,
       ],
       [
@@ -437,7 +437,7 @@
           '#value' => ['baz'],
           '#multiple' => TRUE,
         ],
-        'An invalid choice has been detected. Please, contact the site administrator.',
+        'An invalid choice has been detected. Please contact the site administrator.',
         TRUE,
       ],
       [
@@ -450,7 +450,7 @@
           '#value' => ['baz'],
           '#multiple' => TRUE,
         ],
-        'An invalid choice has been detected. Please, contact the site administrator.',
+        'An invalid choice has been detected. Please contact the site administrator.',
         TRUE,
       ],
       [
only in patch2:
unchanged:
--- a/composer.json
+++ b/composer.json
@@ -12,7 +12,8 @@
         "composer/installers": "^2.0",
         "drupal/core": "self.version",
         "drupal/core-project-message": "self.version",
-        "drupal/core-vendor-hardening": "self.version"
+        "drupal/core-vendor-hardening": "self.version",
+        "drupal/admin_toolbar": "^3.1"
     },
     "require-dev": {
         "behat/mink": "^1.10",
only in patch2:
unchanged:
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "85fce9014bf3bc99add14de1104ac465",
+    "content-hash": "68167c5d62009bed340481c784f7e381",
     "packages": [
         {
             "name": "asm89/stack-cors",
@@ -441,6 +441,87 @@
             "time": "2022-02-28T11:07:21+00:00"
         },
         {
+            "name": "drupal/admin_toolbar",
+            "version": "3.3.0",
+            "source": {
+                "type": "git",
+                "url": "https://git.drupalcode.org/project/admin_toolbar.git",
+                "reference": "3.3.0"
+            },
+            "dist": {
+                "type": "zip",
+                "url": "https://ftp.drupal.org/files/projects/admin_toolbar-3.3.0.zip",
+                "reference": "3.3.0",
+                "shasum": "8e61fba9c9d83a94a844cff96d00871878a7eb98"
+            },
+            "require": {
+                "drupal/core": "^9.2 || ^10"
+            },
+            "require-dev": {
+                "drupal/admin_toolbar_tools": "*"
+            },
+            "type": "drupal-module",
+            "extra": {
+                "drupal": {
+                    "version": "3.3.0",
+                    "datestamp": "1669567837",
+                    "security-coverage": {
+                        "status": "covered",
+                        "message": "Covered by Drupal's security advisory policy"
+                    }
+                }
+            },
+            "notification-url": "https://packages.drupal.org/8/downloads",
+            "license": [
+                "GPL-2.0-or-later"
+            ],
+            "authors": [
+                {
+                    "name": "Wilfrid Roze (eme)",
+                    "homepage": "https://www.drupal.org/u/eme",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "Romain Jarraud (romainj)",
+                    "homepage": "https://www.drupal.org/u/romainj",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "Adrian Cid Almaguer (adriancid)",
+                    "homepage": "https://www.drupal.org/u/adriancid",
+                    "email": "adriancid@gmail.com",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "Mohamed Anis Taktak (matio89)",
+                    "homepage": "https://www.drupal.org/u/matio89",
+                    "role": "Maintainer"
+                },
+                {
+                    "name": "matio89",
+                    "homepage": "https://www.drupal.org/user/2320090"
+                },
+                {
+                    "name": "Musa.thomas",
+                    "homepage": "https://www.drupal.org/user/1213824"
+                },
+                {
+                    "name": "romainj",
+                    "homepage": "https://www.drupal.org/user/370706"
+                }
+            ],
+            "description": "Provides a drop-down menu interface to the core Drupal Toolbar.",
+            "homepage": "http://drupal.org/project/admin_toolbar",
+            "keywords": [
+                "Drupal",
+                "Toolbar"
+            ],
+            "support": {
+                "source": "https://git.drupalcode.org/project/admin_toolbar",
+                "issues": "https://www.drupal.org/project/issues/admin_toolbar"
+            }
+        },
+        {
             "name": "drupal/core",
             "version": "10.1.x-dev",
             "dist": {
only in patch2:
unchanged:
--- a/composer/Metapackage/CoreRecommended/composer.json
+++ b/composer/Metapackage/CoreRecommended/composer.json
@@ -12,6 +12,7 @@
         "composer/semver": "~3.3.2",
         "doctrine/annotations": "~1.14.2",
         "doctrine/lexer": "~1.2.3",
+        "drupal/admin_toolbar": "~3.3.0",
         "egulias/email-validator": "~3.2.1",
         "guzzlehttp/guzzle": "~7.5.0",
         "guzzlehttp/promises": "~1.5.2",