Issue #2127941 by Gábor Hojtsy: Remove two (out of 3) bogus and duplicate date languages UIs.

core/modules/language/language.local_tasks.yml

-system.date_format_language_overview:
-  title: 'Localize'
-  route_name: system.date_format_language_overview
-  tab_root_id: system.date_format_list
-  weight: -8
-
 language.admin_overview:
   title: 'List'
   route_name: language.admin_overview

core/modules/language/tests/Drupal/language/Tests/Menu/LanguageLocalTasks.php

@@ -60,14 +60,4 @@ public function testLanguageEditLocalTasks() {
     ));
   }
 
-  /**
-   * Tests language date format local tasks.
-   */
-  public function testLanguageDateLocalTasks() {
-    $this->assertLocalTasks('system.date_format_language_overview', array(
-      0 => array('system.date_format_language_overview'),
-    ));
-  }
-
-
 }

core/modules/system/config/schema/system.schema.yml

@@ -130,12 +130,6 @@ system.date_format.*:
     locked:
       type: boolean
       label: 'Locked'
-    locales:
-      type: sequence
-      label: 'Languages'
-      sequence:
-        - type: string
-          label: 'Language'
     pattern:
       type: mapping
       label: 'Format string'

core/modules/system/config/system.date_format.fallback.yml

@@ -4,7 +4,6 @@ label: 'Fallback date format'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: 'D, m/d/Y - H:i'
   intl: 'ccc, MM/dd/yyyy - kk:mm'

core/modules/system/config/system.date_format.html_date.yml

@@ -4,7 +4,6 @@ label: 'HTML Date'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: Y-m-d
   intl: yyyy-MM-dd

core/modules/system/config/system.date_format.html_datetime.yml

@@ -4,7 +4,6 @@ label: 'HTML Datetime'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: 'Y-m-d\TH:i:sO'
   intl: 'yyyy-MM-dd''T''kk:mm:ssZZ'

core/modules/system/config/system.date_format.html_month.yml

@@ -4,7 +4,6 @@ label: 'HTML Month'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: Y-m
   intl: Y-MM

core/modules/system/config/system.date_format.html_time.yml

@@ -4,7 +4,6 @@ label: 'HTML Time'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: 'H:i:s'
   intl: 'H:mm:ss'

core/modules/system/config/system.date_format.html_week.yml

@@ -4,7 +4,6 @@ label: 'HTML Week'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: Y-\WW
   intl: 'Y-''W''WW'

core/modules/system/config/system.date_format.html_year.yml

@@ -4,7 +4,6 @@ label: 'HTML Year'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: Y
   intl: Y

core/modules/system/config/system.date_format.html_yearless_date.yml

@@ -4,7 +4,6 @@ label: 'HTML Yearless date'
 status: true
 langcode: en
 locked: true
-locales: {  }
 pattern:
   php: m-d
   intl: MM-d

core/modules/system/config/system.date_format.long.yml

@@ -4,7 +4,6 @@ label: 'Default long date'
 status: true
 langcode: en
 locked: false
-locales: {  }
 pattern:
   php: 'l, F j, Y - H:i'
   intl: 'EEEE, LLLL d, yyyy - kk:mm'

core/modules/system/config/system.date_format.medium.yml

@@ -4,7 +4,6 @@ label: 'Default medium date'
 status: true
 langcode: en
 locked: false
-locales: {  }
 pattern:
   php: 'D, m/d/Y - H:i'
   intl: 'ccc, MM/dd/yyyy - kk:mm'

core/modules/system/config/system.date_format.short.yml

@@ -4,7 +4,6 @@ label: 'Default short date'
 status: true
 langcode: en
 locked: false
-locales: {  }
 pattern:
   php: 'm/d/Y - H:i'
   intl: 'MM/dd/yyyy - kk:mm'

core/modules/system/lib/Drupal/system/Controller/DateFormatLanguageController.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\system\Controller\LanguageDateFormatController.
- */
-
-namespace Drupal\system\Controller;
-
-/**
- * Controller for Language Date Format handling.
- */
-class DateFormatLanguageController {
-
-  /**
-   * Displays edit date format links for each language.
-   *
-   * @return array
-   *   Render array of overview page.
-   */
-  public function overviewPage() {
-
-    $header = array(t('Language'), t('Operations'));
-
-    $languages = language_list();
-    foreach ($languages as $langcode => $language) {
-      $row = array();
-      $row[] = $language->name;
-      $links = array();
-      $links['edit'] = array(
-        'title' => t('Edit'),
-        'href' => 'admin/config/regional/date-time/locale/' . $langcode . '/edit',
-      );
-      $links['reset'] = array(
-        'title' => t('Reset'),
-        'href' => 'admin/config/regional/date-time/locale/' . $langcode . '/reset',
-      );
-      $row[] = array(
-        'data' => array(
-          '#type' => 'operations',
-          '#links' => $links,
-        ),
-      );
-      $rows[] = $row;
-    }
-
-    return array('#theme' => 'table', '#header' => $header, '#rows' => $rows);
-
-  }
-
-}

core/modules/system/lib/Drupal/system/DateFormatInterface.php

@@ -39,44 +39,6 @@ public function getPattern($type = DrupalDateTime::PHP);
    */
   public function setPattern($pattern, $type = DrupalDateTime::PHP);
 
-  /**
-   * Adds a locale for this date format.
-   *
-   * @param string $locale
-   *   The locale to add for this format.
-   *
-   * @return self
-   *   Returns the date format.
-   */
-  public function addLocale($locale);
-
-  /**
-   * Sets the locales for this date format. This overwrites existing locales.
-   *
-   * @param array $locales
-   *   The array of locales to set for this format.
-   *
-   * @return self
-   *   Returns the date format.
-   */
-  public function setLocales(array $locales);
-
-  /**
-   * Returns an array of the locales for this date format.
-   *
-   * @return array
-   *   An array of locale names.
-   */
-  public function getLocales();
-
-  /**
-   * Determines if this data format has any locales.
-   *
-   * @return bool
-   *   TRUE if the date format has locales, FALSE otherwise.
-   */
-  public function hasLocales();
-
   /**
    * Determines if this date format is locked.
    *

core/modules/system/lib/Drupal/system/Entity/DateFormat.php

@@ -78,11 +78,6 @@ class DateFormat extends ConfigEntityBase implements DateFormatInterface {
    */
   protected $locked = FALSE;
 
-  /**
-   * @var array
-   */
-  protected $locales = array();
-
   /**
    * {@inheritdoc}
    */
@@ -90,7 +85,6 @@ public function getExportProperties() {
     $properties = parent::getExportProperties();
     $names = array(
       'locked',
-      'locales',
       'pattern',
     );
     foreach ($names as $name) {
@@ -114,37 +108,6 @@ public function setPattern($pattern, $type = DrupalDateTime::PHP) {
     return $this;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function getLocales() {
-    return $this->locales;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function setLocales(array $locales) {
-    $this->locales = $locales;
-    return $this;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function hasLocales() {
-    return !empty($this->locales);
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function addLocale($locale) {
-    $this->locales[] = $locale;
-    $this->locales = array_unique($this->locales);
-    return $this;
-  }
-
   /**
    * {@inheritdoc}
    */
@@ -152,43 +115,4 @@ public function isLocked() {
     return (bool) $this->locked;
   }
 
-  /**
-   * {@inheritdoc}
-   */
-  public function preSave(EntityStorageControllerInterface $storage_controller) {
-    parent::preSave($storage_controller);
-
-    if ($this->hasLocales()) {
-      $config_factory = \Drupal::service('config.factory');
-      $properties = $this->getExportProperties();
-      $languages = language_list();
-      // Check if the suggested language codes are configured.
-      foreach ($this->getLocales() as $langcode) {
-        if (isset($languages[$langcode])) {
-          $config_factory->get('locale.config.' . $langcode . '.system.date_format.' . $this->id())
-            ->setData($properties)
-            ->save();
-        }
-      }
-    }
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function postDelete(EntityStorageControllerInterface $storage_controller, array $entities) {
-    parent::postDelete($storage_controller, $entities);
-
-    // Clean up the localized entry if required.
-    if (\Drupal::moduleHandler()->moduleExists('language')) {
-      $languages = language_list();
-      foreach ($entities as $entity) {
-        $format_id = $entity->id();
-        foreach ($languages as $langcode => $data) {
-          \Drupal::config("locale.config.$langcode.system.date_format.$format_id")->delete();
-        }
-      }
-    }
-  }
-
 }

core/modules/system/lib/Drupal/system/Form/DateFormatFormBase.php

@@ -11,6 +11,7 @@
 use Drupal\Core\Ajax\ReplaceCommand;
 use Drupal\Core\Config\Entity\ConfigStorageController;
 use Drupal\Core\Datetime\Date;
+use Drupal\Core\Language\Language;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Drupal\Core\Datetime\DrupalDateTime;
 use Drupal\Core\Entity\Query\QueryFactory;
@@ -168,22 +169,12 @@ public function form(array $form, array &$form_state) {
       '#required' => TRUE,
     );
 
-    $languages = language_list();
-
-    $options = array();
-    foreach ($languages as $langcode => $data) {
-      $options[$langcode] = $data->name;
-    }
-
-    if (!empty($options)) {
-      $form['locales'] = array(
-        '#title' => t('Languages'),
-        '#type' => 'select',
-        '#options' => $options,
-        '#multiple' => TRUE,
-        '#default_value' => $this->entity->getLocales(),
-      );
-    }
+    $form['langcode'] = array(
+      '#type' => 'language_select',
+      '#title' => t('Language'),
+      '#languages' => Language::STATE_ALL,
+      '#default_value' => $this->entity->langcode,
+    );
 
     return parent::form($form, $form_state);
   }

core/modules/system/lib/Drupal/system/Form/DateFormatLocalizeResetForm.php

-<?php
-
-/**
- * @file
- * Contains \Drupal\system\Form\DateFormatLocalizeResetForm.
- */
-
-namespace Drupal\system\Form;
-
-use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
-use Drupal\Core\Form\ConfirmFormBase;
-use Drupal\Core\Config\ConfigFactory;
-use Symfony\Component\DependencyInjection\ContainerInterface;
-
-/**
- * Builds a form for enabling a module.
- */
-class DateFormatLocalizeResetForm extends ConfirmFormBase implements ContainerInjectionInterface {
-
-  /**
-   * The language to be reset.
-   *
-   * @var \Drupal\Core\Language\Language;
-   */
-  protected $language;
-
-  /**
-   * The config factory.
-   *
-   * @var \Drupal\Core\Config\ConfigFactory
-   */
-  protected $configFactory;
-
-  /**
-   * Constructs a DateFormatLocalizeResetForm object.
-   *
-   * @param \Drupal\Core\Config\ConfigFactory $config_factory
-   *   The config factory.
-   */
-  public function __construct(ConfigFactory $config_factory) {
-    $this->configFactory = $config_factory;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public static function create(ContainerInterface $container) {
-    return new static(
-      $container->get('config.factory')
-    );
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getFormId() {
-    return 'system_date_format_localize_reset_form';
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getQuestion() {
-    return t('Are you sure you want to reset the date formats for %language to the global defaults?', array(
-      '%language' => $this->language->name,
-    ));
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getConfirmText() {
-    return t('Reset');
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getCancelRoute() {
-    return array(
-      'route_name' => 'system.date_format_language_overview',
-    );
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getDescription() {
-    return t('Resetting will remove all localized date formats for this language. This action cannot be undone.');
-  }
-
-  /**
-   * {@inheritdoc}
-   *
-   * @param string $langcode
-   *   The language code.
-   *
-   */
-  public function buildForm(array $form, array &$form_state, $langcode = NULL) {
-    $this->language = language_load($langcode);
-
-    return parent::buildForm($form, $form_state);
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function submitForm(array &$form, array &$form_state) {
-    foreach (config_get_storage_names_with_prefix('locale.config.' . $this->language->id . '.system.date_format.') as $config_id) {
-      $this->configFactory->get($config_id)->delete();
-    }
-    entity_render_cache_clear();
-
-    $form_state['redirect'] = 'admin/config/regional/date-time/locale';
-  }
-
-}

core/modules/system/lib/Drupal/system/Form/SystemForm.php

-<?php
-/**
- * @file
- * Contains \Drupal\system\Form\SystemForm.
- */
-
-namespace Drupal\system\Form;
-
-/**
- * Temporary form controller for system module.
- */
-class SystemForm {
-
-  /**
-   * Wraps system_date_format_localize_form().
-   *
-   * @todo Remove system_date_format_localize_form().
-   */
-  public function localizeDateFormat($langcode) {
-    module_load_include('admin.inc', 'system');
-    return drupal_get_form('system_date_format_localize_form', $langcode);
-  }
-
-}