diff --git a/core/modules/language/lib/Drupal/language/Tests/LanguageCustomLanguageConfigurationTest.php b/core/modules/language/lib/Drupal/language/Tests/LanguageCustomLanguageConfigurationTest.php
index 9b3f1b8..441e9e7 100644
--- a/core/modules/language/lib/Drupal/language/Tests/LanguageCustomLanguageConfigurationTest.php
+++ b/core/modules/language/lib/Drupal/language/Tests/LanguageCustomLanguageConfigurationTest.php
@@ -38,22 +38,22 @@ class LanguageCustomLanguageConfigurationTest extends WebTestBase {
   public function testLanguageConfiguration() {
     global $base_url;
 
-    // User to add and remove language.
+    // Create user with permissions to add and remove languages.
     $admin_user = $this->drupalCreateUser(array('administer languages', 'access administration pages'));
     $this->drupalLogin($admin_user);
 
     // Add custom language.
-    // Test validation on missing values.
     $edit = array(
       'predefined_langcode' => 'custom',
     );
     $this->drupalPost('admin/config/regional/language/add', $edit, t('Add custom language'));
+    // Test validation on missing values.
     $this->assertText(t('!name field is required.', array('!name' => t('Language code'))));
     $this->assertText(t('!name field is required.', array('!name' => t('Language name'))));
     $this->assertText(t('!name field is required.', array('!name' => t('Direction'))));
-    $this->assertEqual($this->getUrl(), url('admin/config/regional/language/add', array('absolute' => TRUE)), t('Correct page redirection.'));
+    $this->assertEqual($this->getUrl(), url('admin/config/regional/language/add', array('absolute' => TRUE)), 'Correct page redirection.');
 
-    // Test validation off invalid values.
+    // Test validation of invalid values.
     $edit = array(
       'predefined_langcode' => 'custom',
       'langcode' => 'white space',
@@ -63,29 +63,30 @@ class LanguageCustomLanguageConfigurationTest extends WebTestBase {
     $this->drupalPost('admin/config/regional/language/add', $edit, t('Add custom language'));
     $this->assertRaw(t('%field may only contain characters a-z, underscores, or hyphens.', array('%field' => t('Language code'))));
     $this->assertRaw(t('%field cannot contain any markup.', array('%field' => t('Language name'))));
-    $this->assertEqual($this->getUrl(), url('admin/config/regional/language/add', array('absolute' => TRUE)), t('Correct page redirection.'));
+    $this->assertEqual($this->getUrl(), url('admin/config/regional/language/add', array('absolute' => TRUE)), 'Correct page redirection.');
 
-    // Test validation off existing language values.
+    // Test validation of existing language values.
     $edit = array(
       'predefined_langcode' => 'custom',
       'langcode' => 'de',
       'name' => 'German',
       'direction' => LANGUAGE_LTR,
     );
+    
     // Add the language the first time.
     $this->drupalPost('admin/config/regional/language/add', $edit, t('Add custom language'));
     $this->assertRaw(t(
       'The language %language has been created and can now be used.',
       array('%language' => $edit['name'])
     ));
-    $this->assertEqual($this->getUrl(), url('admin/config/regional/language', array('absolute' => TRUE)), t('Correct page redirection.'));
+    $this->assertEqual($this->getUrl(), url('admin/config/regional/language', array('absolute' => TRUE)), 'Correct page redirection.');
 
-    // Add the language a second time.
+    // Add the language a second time and confirm that this is not allowed.
     $this->drupalPost('admin/config/regional/language/add', $edit, t('Add custom language'));
     $this->assertRaw(t(
       'The language %language (%langcode) already exists.',
       array('%language' => $edit['name'], '%langcode' => $edit['langcode'])
     ));
-    $this->assertEqual($this->getUrl(), url('admin/config/regional/language/add', array('absolute' => TRUE)), t('Correct page redirection.'));
+    $this->assertEqual($this->getUrl(), url('admin/config/regional/language/add', array('absolute' => TRUE)), 'Correct page redirection.');
   }
 }