7 string references to 'Required'

comment_form_node_type_form_alter in drupal/core/modules/comment/comment.module
Implements hook_form_FORM_ID_alter().
ElementsLabelsTest::testFormLabels in drupal/core/modules/system/lib/Drupal/system/Tests/Form/ElementsLabelsTest.php
Test form elements, labels, title attibutes and required marks output correctly and have the correct label option class if needed.
FilterPluginBase::buildExposeForm in drupal/core/modules/views/lib/Drupal/views/Plugin/views/filter/FilterPluginBase.php
Options form subform for exposed filter options.
form_pre_render_conditional_form_element in drupal/core/includes/form.inc
Adds form element theming to an element if its title or description is set.
form_test_menu in drupal/core/modules/system/tests/modules/form_test/form_test.module
Implements hook_menu().
link_field_instance_settings_form in drupal/core/modules/field/modules/link/link.module
Implements hook_field_instance_settings_form().
node_type_form in drupal/core/modules/node/content_types.inc
Form constructor for the node type editing form.