fixes

Closes #3464591

core/modules/field/tests/modules/field_test/src/Form/NestedEntityTestForm.php

@@ -40,7 +40,7 @@ public function buildForm(array $form, FormStateInterface $form_state, ?EntityIn
     $form_state->set('form_display_2', $form_display_2);
     $form['entity_2'] = [
       '#type' => 'details',
-      '#title' => t('Second entity'),
+      '#title' => $this->t('Second entity'),
       '#tree' => TRUE,
       '#parents' => ['entity_2'],
       '#weight' => 50,
@@ -60,7 +60,7 @@ public function buildForm(array $form, FormStateInterface $form_state, ?EntityIn
 
     $form['save'] = [
       '#type' => 'submit',
-      '#value' => t('Save'),
+      '#value' => $this->t('Save'),
       '#weight' => 100,
     ];