diff --git a/core/lib/Drupal/Core/ParamConverter/AdminPathConfigEntityConverter.php b/core/lib/Drupal/Core/ParamConverter/AdminPathConfigEntityConverter.php
index 89c5914..3f3e9a7 100644
--- a/core/lib/Drupal/Core/ParamConverter/AdminPathConfigEntityConverter.php
+++ b/core/lib/Drupal/Core/ParamConverter/AdminPathConfigEntityConverter.php
@@ -18,7 +18,9 @@
  * Converts entity route arguments to unmodified entities as opposed to
  * converting to entities with overrides, such as the negotiated language.
  *
- * This converter applies only if the path is an admin path.
+ * This converter applies only if the path is an admin path, the entity is
+ * a config entity, and the "use_current_language" element is not set to TRUE
+ * on the parameter definition.
  *
  * Due to this converter having a higher weight than the default
  * EntityConverter, every time this applies, it takes over the conversion duty
@@ -88,6 +90,10 @@ public function convert($value, $definition, $name, array $defaults) {
    * {@inheritdoc}
    */
   public function applies($definition, $name, Route $route) {
+    if (isset($definition['use_current_language']) && $definition['use_current_language']) {
+      return FALSE;
+    }
+
     if (parent::applies($definition, $name, $route)) {
       $entity_type_id = substr($definition['type'], strlen('entity:'));
       // If the entity type is dynamic, defer checking to self::convert().
diff --git a/core/modules/language/src/Tests/AdminPathEntityConverterLanguageTest.php b/core/modules/language/src/Tests/AdminPathEntityConverterLanguageTest.php
new file mode 100644
index 0000000..1e74dbc
--- /dev/null
+++ b/core/modules/language/src/Tests/AdminPathEntityConverterLanguageTest.php
@@ -0,0 +1,50 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\language\Tests\AdminPathEntityConverterLanguageTest.
+ */
+
+namespace Drupal\language\Tests;
+
+use Drupal\language\Entity\ConfigurableLanguage;
+use Drupal\simpletest\WebTestBase;
+
+/**
+ * Test administration path based conversion of entities.
+ *
+ * @group language
+ */
+class AdminPathEntityConverterLanguageTest extends WebTestBase {
+
+  public static $modules = array('language', 'language_test');
+
+  protected function setUp() {
+    parent::setUp();
+    $permissions = array(
+      'access administration pages',
+      'administer site configuration',
+    );
+    $this->drupalLogin($this->drupalCreateUser($permissions));
+    ConfigurableLanguage::createFromLangcode('es')->save();
+  }
+
+  /**
+   * Tests the translated and untranslated config entities are loaded properly.
+   */
+  public function testConfigUsingCurrentLanguage() {
+    \Drupal::languageManager()
+      ->getLanguageConfigOverride('es', 'language.entity.es')
+      ->set('label', 'Español')
+      ->save();
+
+    $this->drupalGet('es/admin/language_test/entity_using_current_language/es');
+    $this->assertNoRaw(t('Loaded %label.', array('%label' => 'Spanish')));
+    $this->assertRaw(t('Loaded %label.', array('%label' => 'Español')));
+
+    $this->drupalGet('es/admin/language_test/entity_using_original_language/es');
+    $this->assertRaw(t('Loaded %label.', array('%label' => 'Spanish')));
+    $this->assertNoRaw(t('Loaded %label.', array('%label' => 'Español')));
+  }
+
+}
diff --git a/core/modules/language/tests/language_test/language_test.routing.yml b/core/modules/language/tests/language_test/language_test.routing.yml
index bc1168b..4f9a78c 100644
--- a/core/modules/language/tests/language_test/language_test.routing.yml
+++ b/core/modules/language/tests/language_test/language_test.routing.yml
@@ -11,3 +11,23 @@ language_test.subrequest:
     _controller: '\Drupal\language_test\Controller\LanguageTestController::testSubRequest'
   requirements:
     _access: 'TRUE'
+
+language_test.entity_using_original_language:
+  path: '/admin/language_test/entity_using_original_language/{configurable_language}'
+  defaults:
+    _controller: '\Drupal\language_test\Controller\LanguageTestController::testEntity'
+  requirements:
+    _access: 'TRUE'
+
+language_test.entity_using_current_language:
+  path: '/admin/language_test/entity_using_current_language/{configurable_language}'
+  defaults:
+    _controller: '\Drupal\language_test\Controller\LanguageTestController::testEntity'
+  requirements:
+    _access: 'TRUE'
+  options:
+    parameters:
+      configurable_language:
+        type: entity:configurable_language
+        # Force load in current interface language.
+        use_current_language: 'TRUE'
diff --git a/core/modules/language/tests/language_test/src/Controller/LanguageTestController.php b/core/modules/language/tests/language_test/src/Controller/LanguageTestController.php
index 6766d4a..c783d3a 100644
--- a/core/modules/language/tests/language_test/src/Controller/LanguageTestController.php
+++ b/core/modules/language/tests/language_test/src/Controller/LanguageTestController.php
@@ -9,7 +9,9 @@
 
 use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
 use Drupal\Core\Language\LanguageManagerInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
 use Drupal\Core\Url;
+use Drupal\language\ConfigurableLanguageInterface;
 use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\HttpKernel\HttpKernelInterface;
@@ -19,6 +21,8 @@
  */
 class LanguageTestController implements ContainerInjectionInterface {
 
+  use StringTranslationTrait;
+
   /**
    * The HTTP kernel service.
    *
@@ -52,6 +56,19 @@ public static function create(ContainerInterface $container) {
   }
 
   /**
+   * Route entity upcasting test helper.
+   *
+   * @param \Drupal\language\ConfigurableLanguageInterface $language
+   *   The ConfigurableLanguage object from the route.
+   *
+   * @return string
+   *   Testing feedback based on (translated) entity title.
+   */
+  public function testEntity(ConfigurableLanguageInterface $configurable_language) {
+    return array('#markup' => $this->t('Loaded %label.', array('%label' => $configurable_language->label())));
+  }
+
+  /**
    * Returns links to the current page with different langcodes.
    *
    * Using #type 'link' causes these links to be rendered with _l().
diff --git a/core/modules/system/core.api.php b/core/modules/system/core.api.php
index 008e99c..96410cc 100644
--- a/core/modules/system/core.api.php
+++ b/core/modules/system/core.api.php
@@ -321,6 +321,31 @@
  *   Configuration entity classes expose dependencies by overriding the
  *   \Drupal\Core\Config\Entity\ConfigEntityInterface::calculateDependencies()
  *   method.
+ * - On routes for paths staring with '\admin' with configuration entity
+ *   placeholders, configuration entities are normally loaded in their original
+ *   language, not translated. This is usually desirable, because most admin
+ *   paths are for editing configuration, and you need that to be in the source
+ *   language. If for some reason you need to have your configuration entity
+ *   loaded in the currently-selected language on an admin path (for instance,
+ *   if you go to example.com/es/admin/your_path and you need the entity to be
+ *   in Spanish), then you can add a 'use_current_language' parameter option to
+ *   your route. Here's an example using the configurable_language config
+ *   entity:
+ *   @code
+ *   mymodule.myroute:
+ *     path: '/admin/mypath/{configurable_language}'
+ *     defaults:
+ *       _controller: '\Drupal\mymodule\MyController::myMethod'
+ *     options:
+ *       parameters:
+ *         configurable_language:
+ *           type: entity:configurable_language
+ *           use_current_language: 'TRUE'
+ *   @endcode
+ *   With the route defined this way, the $configurable_language parameter to
+ *   your controller method will come in translated to the current language.
+ *   Without the parameter options section, it would be in the original
+ *   language, untranslated.
  *
  * @see i18n
  *