diff -u b/core/lib/Drupal/Core/Field/WidgetBase.php b/core/lib/Drupal/Core/Field/WidgetBase.php
--- b/core/lib/Drupal/Core/Field/WidgetBase.php
+++ b/core/lib/Drupal/Core/Field/WidgetBase.php
@@ -286,8 +286,7 @@
         $elements['add_more'] = [
           '#type' => 'submit',
           '#name' => strtr($id_prefix, '-', '_') . '_add_more',
-          // delta + 1 should equal the count since the array is 0 indexed.
-          '#value' => $this->formatPlural($delta + 1, 'Add item', 'Add another item'),
+          '#value' => t('Add another item'),
           '#attributes' => ['class' => ['field-add-more-submit']],
           '#limit_validation_errors' => [array_merge($parents, [$field_name])],
           '#submit' => [[static::class, 'addMoreSubmit']],