Issue #2580177 by DuaelFr, GoZ: Language list is not correctly ordered when it's localized

core/modules/language/src/ConfigurableLanguageManager.php

@@ -472,7 +472,7 @@ class ConfigurableLanguageManager extends LanguageManager implements Configurabl
       }
       $predefined[$key] = new TranslatableMarkup($value[0]);
     }
-    asort($predefined);
+    natcasesort($predefined);
     return $predefined;
   }
 

core/modules/language/src/Tests/LanguageLocaleListTest.php

@@ -0,0 +1,79 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\language\Tests\LanguageListTest.
+ */
+
+namespace Drupal\language\Tests;
+
+use Drupal\simpletest\WebTestBase;
+use Drupal\Core\Language\Language;
+use Drupal\Core\Language\LanguageInterface;
+
+/**
+ * Adds a new language with translations and tests language list order.
+ *
+ * @group language
+ */
+class LanguageLocaleListTest extends WebTestBase {
+
+  /**
+   * Modules to enable.
+   *
+   * @var array
+   */
+  public static $modules = array('language', 'locale');
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function setUp() {
+    parent::setUp();
+    // Add a default locale storage for all these tests.
+    $this->storage = $this->container->get('locale.storage');
+  }
+
+  /**
+   * Tests adding, editing, and deleting languages.
+   */
+  function testLanguageLocaleList() {
+    // User to add and remove language.
+    $admin_user = $this->drupalCreateUser(array('administer languages', 'access administration pages'));
+    $this->drupalLogin($admin_user);
+
+    // Add predefined language.
+    $edit = array(
+      'predefined_langcode' => 'fr',
+    );
+    $this->drupalPostForm('admin/config/regional/language/add', $edit, t('Add language'));
+    $this->assertText('The language French has been created and can now be used');
+    $this->assertUrl(\Drupal::url('entity.configurable_language.collection', [], ['absolute' => TRUE]));
+    $this->rebuildContainer();
+
+    // Translate Spanish language to French (Espagnol).
+    $source = $this->storage->createString(array(
+      'source' => 'Spanish',
+      'context' => '',
+    ))->save();
+    $this->storage->createTranslation(array(
+      'lid' => $source->lid,
+      'language' => 'fr',
+      'translation' => 'Espagnol',
+    ))->save();
+
+    // Get language list displayed in select list.
+    $this->drupalGet('fr/admin/config/regional/language/add');
+    $select = $this->xpath('//select[@id="edit-predefined-langcode"]');
+    $select_element = (array) end($select);
+    $options = $select_element['option'];
+    // Remove the 'Custom language...' option form the end.
+    array_pop($options);
+    // Order language list.
+    $options_ordered = $options;
+    natcasesort($options_ordered);
+
+    // Check the language list displayed is ordered.
+    $this->assertTrue($options === $options_ordered, 'Language list is ordered.');
+  }
+}