diff --git a/core/modules/language/src/Form/NegotiationBrowserDeleteForm.php b/core/modules/language/src/Form/NegotiationBrowserDeleteForm.php
index 2cf5a6c..aa8fbea 100644
--- a/core/modules/language/src/Form/NegotiationBrowserDeleteForm.php
+++ b/core/modules/language/src/Form/NegotiationBrowserDeleteForm.php
@@ -66,13 +66,13 @@ public function submitForm(array &$form, FormStateInterface $form_state) {
       unset($mappings[$this->browserLangcode]);
       language_set_browser_drupal_langcode_mappings($mappings);
 
-      $t_args = array(
+      $args = array(
         '%browser' => $this->browserLangcode,
       );
 
-      $this->logger('language')->notice('The browser language detection mapping for the %browser browser language code has been deleted.', $t_args);
+      $this->logger('language')->notice('The browser language detection mapping for the %browser browser language code has been deleted.', $args);
 
-      drupal_set_message(t('The mapping for the %browser browser language code has been deleted.', $t_args));
+      drupal_set_message($this->t('The mapping for the %browser browser language code has been deleted.', $args));
     }
 
     $form_state->setRedirect('language.negotiation_browser');
diff --git a/core/modules/language/src/Form/NegotiationBrowserForm.php b/core/modules/language/src/Form/NegotiationBrowserForm.php
index d4edfcc..8cbac11 100644
--- a/core/modules/language/src/Form/NegotiationBrowserForm.php
+++ b/core/modules/language/src/Form/NegotiationBrowserForm.php
@@ -89,7 +89,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
     foreach ($mappings as $browser_langcode => $drupal_langcode) {
       $form['mappings'][$browser_langcode] = array(
         'browser_langcode' => array(
-          '#title' => t('Browser language code'),
+          '#title' => $this->t('Browser language code'),
           '#title_display' => 'invisible',
           '#type' => 'textfield',
           '#default_value' => $browser_langcode,
@@ -97,7 +97,7 @@ public function buildForm(array $form, FormStateInterface $form_state) {
           '#required' => TRUE,
         ),
         'drupal_langcode' => array(
-          '#title' => t('Site language'),
+          '#title' => $this->t('Site language'),
           '#title_display' => 'invisible',
           '#type' => 'select',
           '#options' => $language_options,
@@ -141,10 +141,10 @@ public function validateForm(array &$form, FormStateInterface $form_state) {
       foreach ($mappings as $key => $data) {
         // Make sure browser_langcode is unique.
         if (array_key_exists($data['browser_langcode'], $unique_values)) {
-          $form_state->setErrorByName('mappings][new_mapping][browser_langcode', t('Browser language codes must be unique.'));
+          $form_state->setErrorByName('mappings][new_mapping][browser_langcode', $this->t('Browser language codes must be unique.'));
         }
         elseif (preg_match('/[^a-z\-]/', $data['browser_langcode'])) {
-          $form_state->setErrorByName('mappings][new_mapping][browser_langcode', t('Browser language codes can only contain lowercase letters and a hyphen(-).'));
+          $form_state->setErrorByName('mappings][new_mapping][browser_langcode', $this->t('Browser language codes can only contain lowercase letters and a hyphen(-).'));
         }
         $unique_values[$data['browser_langcode']] = $data['drupal_langcode'];
       }