diff --git a/core/lib/Drupal/Core/Extension/ThemeHandler.php b/core/lib/Drupal/Core/Extension/ThemeHandler.php
index b43d3e4..207959a 100644
--- a/core/lib/Drupal/Core/Extension/ThemeHandler.php
+++ b/core/lib/Drupal/Core/Extension/ThemeHandler.php
@@ -457,6 +457,17 @@ protected function resetSystem() {
   }
 
   /**
+   * {@inheritdoc}
+   */
+  public function getName($theme) {
+    $themes = $this->listInfo();
+    if (!isset($themes[$theme])) {
+      throw new \InvalidArgumentException(String::format('Requested the name of a non-existing theme @theme', array('@theme' => $theme)));
+    }
+    return String::checkPlain($themes[$theme]->info['name']);
+  }
+
+  /**
    * Wraps system_list_reset().
    */
   protected function systemListReset() {
diff --git a/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php b/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php
index 2ba52cd..60057f6 100644
--- a/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php
+++ b/core/lib/Drupal/Core/Extension/ThemeHandlerInterface.php
@@ -105,4 +105,15 @@ public function rebuildThemeData();
    */
   public function getBaseThemes(array $themes, $theme);
 
+  /**
+   * Gets the human readable name of a given theme.
+   *
+   * @param string $theme
+   *   The machine name of the theme which title should be shown.
+   *
+   * @return string
+   *   Returns the human readable name of the theme.
+   */
+  public function getName($theme);
+
 }
diff --git a/core/modules/action/action.routing.yml b/core/modules/action/action.routing.yml
index 09e1433..535830a 100644
--- a/core/modules/action/action.routing.yml
+++ b/core/modules/action/action.routing.yml
@@ -10,6 +10,7 @@ action.admin_add:
   path: '/admin/config/system/actions/add/{action_id}'
   defaults:
     _entity_form: 'action.add'
+    _title: 'Add'
   requirements:
     _permission: 'administer actions'
 
@@ -17,6 +18,7 @@ action.admin_configure:
   path: '/admin/config/system/actions/configure/{action}'
   defaults:
     _entity_form: 'action.edit'
+    _title: 'Edit'
   requirements:
     _permission: 'administer actions'
 
@@ -24,6 +26,7 @@ action.delete:
   path: '/admin/config/system/actions/configure/{action}/delete'
   defaults:
     _entity_form: 'action.delete'
+    _title: 'Delete'
   requirements:
     _permission: 'administer actions'
 
diff --git a/core/modules/block/block.routing.yml b/core/modules/block/block.routing.yml
index 0ea084f..1289c68 100644
--- a/core/modules/block/block.routing.yml
+++ b/core/modules/block/block.routing.yml
@@ -2,6 +2,7 @@ block.admin_demo:
   path: '/admin/structure/block/demo/{theme}'
   defaults:
     _content: '\Drupal\block\Controller\BlockController::demo'
+    _title_callback: 'theme_handler:getName'
   requirements:
     _access_theme: 'TRUE'
     _permission: 'administer blocks'
@@ -20,6 +21,7 @@ block.admin_edit:
   path: '/admin/structure/block/manage/{block}'
   defaults:
     _entity_form: 'block.default'
+    _title: 'Configure block'
   requirements:
     _entity_access: 'block.update'
 
diff --git a/core/modules/block/custom_block/custom_block.routing.yml b/core/modules/block/custom_block/custom_block.routing.yml
index 6cea531..e3b0d87 100644
--- a/core/modules/block/custom_block/custom_block.routing.yml
+++ b/core/modules/block/custom_block/custom_block.routing.yml
@@ -2,6 +2,7 @@ custom_block.type_list:
   path: '/admin/structure/block/custom-blocks/types'
   defaults:
     _entity_list: 'custom_block_type'
+    _title: 'Edit'
   requirements:
     _permission: 'administer blocks'
 
@@ -48,6 +49,7 @@ custom_block.delete:
   path: '/block/{custom_block}/delete'
   defaults:
     _entity_form: 'custom_block.delete'
+    _title: 'Delete'
   options:
     _admin_route: TRUE
   requirements:
@@ -57,6 +59,7 @@ custom_block.type_add:
   path: '/admin/structure/block/custom-blocks/types/add'
   defaults:
     _entity_form: 'custom_block_type.add'
+    _title: 'Add'
   requirements:
     _permission: 'administer blocks'
 
@@ -64,6 +67,7 @@ custom_block.type_edit:
   path: '/admin/structure/block/custom-blocks/manage/{custom_block_type}'
   defaults:
     _entity_form: 'custom_block_type.edit'
+    _title: 'Edit'
   requirements:
     _entity_access: 'custom_block_type.update'
 
diff --git a/core/modules/block/lib/Drupal/block/Controller/BlockController.php b/core/modules/block/lib/Drupal/block/Controller/BlockController.php
index 7b713e4..a4e7952 100644
--- a/core/modules/block/lib/Drupal/block/Controller/BlockController.php
+++ b/core/modules/block/lib/Drupal/block/Controller/BlockController.php
@@ -9,6 +9,9 @@
 
 use Drupal\Component\Utility\String;
 use Drupal\Core\Controller\ControllerBase;
+use Drupal\Core\Extension\ThemeHandler;
+use Drupal\Core\Extension\ThemeHandlerInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
 use Symfony\Component\HttpFoundation\Request;
 
 /**
@@ -17,6 +20,32 @@
 class BlockController extends ControllerBase {
 
   /**
+   * The theme handler.
+   *
+   * @var \Drupal\Core\Extension\ThemeHandlerInterface
+   */
+  protected $themeHandler;
+
+  /**
+   * Constructs a new BlockController instance.
+   *
+   * @param \Drupal\Core\Extension\ThemeHandlerInterface $theme_handler
+   *   The theme handler.
+   */
+  public function __construct(ThemeHandlerInterface $theme_handler) {
+    $this->themeHandler = $theme_handler;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container) {
+    return new static(
+      $container->get('theme_handler')
+    );
+  }
+
+  /**
    * Returns a block theme demo page.
    *
    * @param string $theme
@@ -26,9 +55,8 @@ class BlockController extends ControllerBase {
    *   A render array containing the CSS and title for the block region demo.
    */
   public function demo($theme) {
-    $themes = list_themes();
     return array(
-      '#title' => String::checkPlain($themes[$theme]->info['name']),
+      '#title' => String::checkPlain($this->themeHandler->getName($theme)),
       '#attached' => array(
         'js' => array(
           array(
diff --git a/core/modules/editor/editor.routing.yml b/core/modules/editor/editor.routing.yml
index b99b8ab..8b5e5c1 100644
--- a/core/modules/editor/editor.routing.yml
+++ b/core/modules/editor/editor.routing.yml
@@ -19,6 +19,7 @@ editor.image_dialog:
   path: '/editor/dialog/image/{filter_format}'
   defaults:
     _form: '\Drupal\editor\Form\EditorImageDialog'
+    _title: 'Upload image'
   requirements:
     _entity_access: 'filter_format.use'
 
@@ -26,5 +27,6 @@ editor.link_dialog:
   path: '/editor/dialog/link/{filter_format}'
   defaults:
     _form: '\Drupal\editor\Form\EditorLinkDialog'
+    _title: 'Add link'
   requirements:
     _entity_access: 'filter_format.use'
diff --git a/core/modules/filter/filter.routing.yml b/core/modules/filter/filter.routing.yml
index 1e261f1..1017e2c 100644
--- a/core/modules/filter/filter.routing.yml
+++ b/core/modules/filter/filter.routing.yml
@@ -35,6 +35,7 @@ filter.format_edit:
   path: '/admin/config/content/formats/manage/{filter_format}'
   defaults:
     _entity_form: filter_format.edit
+    _title_callback: '\Drupal\filter\Controller\FilterController::getLabel'
   requirements:
     _entity_access: 'filter_format.update'
 
diff --git a/core/modules/filter/lib/Drupal/filter/Controller/FilterController.php b/core/modules/filter/lib/Drupal/filter/Controller/FilterController.php
index ae8bc01..fe4d94f 100644
--- a/core/modules/filter/lib/Drupal/filter/Controller/FilterController.php
+++ b/core/modules/filter/lib/Drupal/filter/Controller/FilterController.php
@@ -37,4 +37,17 @@ function filterTips(FilterFormatInterface $filter_format = NULL) {
     return $build;
   }
 
+  /**
+   * Gets the label of a filter format.
+   *
+   * @param \Drupal\filter\FilterFormatInterface $filter_format
+   *   The filter format.
+   *
+   * @return string
+   *   The label of the filter format.
+   */
+  public function getLabel(FilterFormatInterface $filter_format) {
+    return $filter_format->label();
+  }
+
 }
diff --git a/core/modules/language/language.routing.yml b/core/modules/language/language.routing.yml
index cda5754..d3ad61c 100644
--- a/core/modules/language/language.routing.yml
+++ b/core/modules/language/language.routing.yml
@@ -2,6 +2,7 @@ language.negotiation_url:
   path: '/admin/config/regional/language/detection/url'
   defaults:
     _form: 'Drupal\language\Form\NegotiationUrlForm'
+    _title: 'Configure URL language negotiation'
   requirements:
     _permission: 'administer languages'
 
@@ -9,6 +10,7 @@ language.negotiation_session:
   path: '/admin/config/regional/language/detection/session'
   defaults:
     _form: 'Drupal\language\Form\NegotiationSessionForm'
+    _title: 'Configure session language negotiation'
   requirements:
     _permission: 'administer languages'
 
@@ -16,6 +18,7 @@ language.negotiation_selected:
   path: '/admin/config/regional/language/detection/selected'
   defaults:
     _form: 'Drupal\language\Form\NegotiationSelectedForm'
+    _title: 'Configure selection language negotiation'
   requirements:
     _permission: 'administer languages'
 
@@ -71,6 +74,7 @@ language.negotiation_browser_delete:
   path: '/admin/config/regional/language/detection/browser/delete/{browser_langcode}'
   defaults:
     _form: '\Drupal\language\Form\NegotiationBrowserDeleteForm'
+    _title: 'Delete'
   requirements:
     _permission: 'administer languages'
 
diff --git a/core/modules/node/node.routing.yml b/core/modules/node/node.routing.yml
index 617b16a..e7ba52d 100644
--- a/core/modules/node/node.routing.yml
+++ b/core/modules/node/node.routing.yml
@@ -56,6 +56,7 @@ node.delete_confirm:
   path: '/node/{node}/delete'
   defaults:
     _entity_form: 'node.delete'
+    _title: 'Delete'
   requirements:
     _entity_access: 'node.delete'
   options:
diff --git a/core/modules/search/search.routing.yml b/core/modules/search/search.routing.yml
index b75ae6e..38afb9f 100644
--- a/core/modules/search/search.routing.yml
+++ b/core/modules/search/search.routing.yml
@@ -57,6 +57,7 @@ search.delete:
   path: '/admin/config/search/pages/manage/{search_page}/delete'
   defaults:
     _entity_form: 'search_page.delete'
+    _title: 'Delete'
   requirements:
     _entity_access: 'search_page.delete'
 
diff --git a/core/modules/shortcut/shortcut.routing.yml b/core/modules/shortcut/shortcut.routing.yml
index d0721c0..100fbc5 100644
--- a/core/modules/shortcut/shortcut.routing.yml
+++ b/core/modules/shortcut/shortcut.routing.yml
@@ -50,6 +50,7 @@ shortcut.link_add:
   path: '/admin/config/user-interface/shortcut/manage/{shortcut_set}/add-link'
   defaults:
     _content: '\Drupal\shortcut\Controller\ShortcutController::addForm'
+    _title: 'Add link'
   requirements:
     _entity_create_access: 'shortcut:{shortcut_set}'
 
@@ -57,6 +58,7 @@ shortcut.link_edit:
   path: '/admin/config/user-interface/shortcut/link/{shortcut}'
   defaults:
     _entity_form: 'shortcut.default'
+    _title: 'Edit'
   requirements:
     _entity_access: 'shortcut.update'
 
@@ -64,6 +66,7 @@ shortcut.link_delete:
   path: '/admin/config/user-interface/shortcut/link/{shortcut}/delete'
   defaults:
     _entity_form: 'shortcut.delete'
+    _title: 'Delete'
   requirements:
     _entity_access: 'shortcut.delete'
 
diff --git a/core/modules/system/lib/Drupal/system/Tests/Menu/BreadcrumbTest.php b/core/modules/system/lib/Drupal/system/Tests/Menu/BreadcrumbTest.php
index bda7efe..849aadc 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Menu/BreadcrumbTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Menu/BreadcrumbTest.php
@@ -138,7 +138,7 @@ function testBreadCrumbs() {
     // @todo Remove this part once we have a _title_callback, see
     //   https://drupal.org/node/2076085.
     $trail += array(
-      "admin/config/content/formats/manage/$format_id" => Unicode::ucfirst(Unicode::strtolower($format->name)),
+      "admin/config/content/formats/manage/$format_id" => $format->label(),
     );
     $this->assertBreadcrumb("admin/config/content/formats/manage/$format_id/disable", $trail);
 
diff --git a/core/modules/system/system.routing.yml b/core/modules/system/system.routing.yml
index 49561c7..b7eabf2 100644
--- a/core/modules/system/system.routing.yml
+++ b/core/modules/system/system.routing.yml
@@ -341,6 +341,7 @@ system.theme_settings_theme:
   path: '/admin/appearance/settings/{theme}'
   defaults:
     _form: '\Drupal\system\Form\ThemeSettingsForm'
+    _title_callback: 'theme_handler:getName'
   requirements:
     _permission: 'administer themes'
 
diff --git a/core/modules/taxonomy/taxonomy.routing.yml b/core/modules/taxonomy/taxonomy.routing.yml
index 014f957..1182589 100644
--- a/core/modules/taxonomy/taxonomy.routing.yml
+++ b/core/modules/taxonomy/taxonomy.routing.yml
@@ -62,6 +62,7 @@ taxonomy.vocabulary_reset:
   path: '/admin/structure/taxonomy/manage/{taxonomy_vocabulary}/reset'
   defaults:
     _entity_form: 'taxonomy_vocabulary.reset'
+    _title: 'Reset'
   requirements:
     _permission: 'administer taxonomy'
 
diff --git a/core/modules/user/user.routing.yml b/core/modules/user/user.routing.yml
index 7812eea..55c57d1 100644
--- a/core/modules/user/user.routing.yml
+++ b/core/modules/user/user.routing.yml
@@ -103,6 +103,7 @@ user.role_edit:
   path: '/admin/people/roles/manage/{user_role}'
   defaults:
     _entity_form: user_role.default
+    _title: 'Edit role'
   requirements:
     _entity_access: user_role.update
 
@@ -110,7 +111,7 @@ user.role_delete:
   path: '/admin/people/roles/manage/{user_role}/delete'
   defaults:
     _entity_form: user_role.delete
-    _title: 'Edit role'
+    _title: 'Delete role'
   requirements:
     _entity_access: user_role.delete
 
diff --git a/core/modules/views_ui/views_ui.routing.yml b/core/modules/views_ui/views_ui.routing.yml
index ee6ad6c..d6b7ac1 100644
--- a/core/modules/views_ui/views_ui.routing.yml
+++ b/core/modules/views_ui/views_ui.routing.yml
@@ -126,6 +126,7 @@ views_ui.break_lock:
   path: '/admin/structure/views/view/{view}/break-lock'
   defaults:
     _entity_form: 'view.break_lock'
+    _title: 'Break lock'
   requirements:
     _permission: 'administer views'