diff -u b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/UriWidget.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/UriWidget.php
--- b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/UriWidget.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldWidget/UriWidget.php
@@ -39,16 +39,16 @@
   public function settingsForm(array $form, array &$form_state) {
     $element['size'] = array(
       '#type' => 'number',
-      '#title' => t('Size of URI field'),
+      '#title' => $this->t('Size of URI field'),
       '#default_value' => $this->getSetting('size'),
       '#required' => TRUE,
       '#min' => 1,
     );
     $element['placeholder'] = array(
       '#type' => 'textfield',
-      '#title' => t('Placeholder'),
+      '#title' => $this->t('Placeholder'),
       '#default_value' => $this->getSetting('placeholder'),
-      '#description' => t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
+      '#description' => $this->t('Text that will be shown inside the field until a value is entered. This hint is usually a sample value or a brief description of the expected format.'),
     );
     return $element;
   }
@@ -59,10 +59,10 @@
   public function settingsSummary() {
     $summary = array();
 
-    $summary[] = t('URI field size: !size', array('!size' => $this->getSetting('size')));
+    $summary[] = $this->t('URI field size: !size', array('!size' => $this->getSetting('size')));
     $placeholder = $this->getSetting('placeholder');
     if (!empty($placeholder)) {
-      $summary[] = t('Placeholder: @placeholder', array('@placeholder' => $placeholder));
+      $summary[] = $this->t('Placeholder: @placeholder', array('@placeholder' => $placeholder));
     }
 
     return $summary;
diff -u b/core/modules/aggregator/lib/Drupal/aggregator/Tests/UpdateFeedTest.php b/core/modules/aggregator/lib/Drupal/aggregator/Tests/UpdateFeedTest.php
--- b/core/modules/aggregator/lib/Drupal/aggregator/Tests/UpdateFeedTest.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Tests/UpdateFeedTest.php
@@ -23,8 +23,8 @@
    * Creates a feed and attempts to update it.
    */
   function testUpdateFeed() {
-    $remamining_fields = array('title[0][value]', 'url[0][value]', '');
-    foreach ($remamining_fields as $same_field) {
+    $remaining_fields = array('title[0][value]', 'url[0][value]', '');
+    foreach ($remaining_fields as $same_field) {
       $feed = $this->createFeed();
 
       // Get new feed data array and modify newly created feed.