diff -u b/src/Form/FlagResetForm.php b/src/Form/FlagResetForm.php
--- b/src/Form/FlagResetForm.php
+++ b/src/Form/FlagResetForm.php
@@ -44,7 +44,7 @@
    * {@inheritdoc}
    */
   public function getQuestion() {
-    return t('Are you sure you want to reset the Flag %label?', [
+    return $this->t('Are you sure you want to reset the Flag %label?', [
       '%label' => $this->flag->label(),
     ]);
   }
@@ -53,7 +53,7 @@
    * {@inheritdoc}
    */
   public function getDescription() {
-    return t('All flaggings created with Flag %label will be deleted.', [
+    return $this->t('All flaggings created with Flag %label will be deleted.', [
       '%label' => $this->flag->label(),
     ]);
   }
@@ -62,7 +62,7 @@
    * {@inheritdoc}
    */
   public function getConfirmText() {
-    return t('Reset');
+    return $this->t('Reset');
   }
 
   /**
@@ -77,7 +77,7 @@
    */
   public function submitForm(array &$form, FormStateInterface $form_state) {
     flag_reset_flag($this->flag);
-    drupal_set_message(t('Flag %label was reset.', [
+    drupal_set_message($this->t('Flag %label was reset.', [
       '%label' => $this->flag->label(),
     ]));