Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/config_translation/config_translation.api.php

@@ -0,0 +1,93 @@
+<?php
+
+/**
+ * @file
+ * Hooks provided by the Configuration Translation module.
+ */
+
+/**
+ * @addtogroup hooks
+ * @{
+ */
+
+/**
+ * Introduce dynamic translation tabs for translation of configuration.
+ *
+ * This hook augments MODULE.config_translation.yml as well as
+ * THEME.config_translation.yml files to collect dynamic translation mapper
+ * information. If your information is static, just provide such a YAML file
+ * with your module containing the mapping.
+ *
+ * Note that while themes can provide THEME.config_translation.yml files this
+ * hook is not invoked for themes.
+ *
+ * @param array $info
+ *   An associative array of configuration mapper information. Use an entity
+ *   name for the key (for entity mapping) or a unique string for configuration
+ *   name list mapping. The values of the associative array are arrays
+ *   themselves in the same structure as the *.config_translation.yml files.
+ *
+ * @see hook_config_translation_info_alter()
+ * @see \Drupal\config_translation\ConfigMapperManagerInterface
+ * @see \Drupal\config_translation\Routing\RouteSubscriber::routes()
+ */
+function hook_config_translation_info(&$info) {
+  $entity_manager = \Drupal::entityManager();
+  $route_provider = \Drupal::service('router.route_provider');
+
+  // If field UI is not enabled, the base routes of the type
+  // "entity.field_config.{$entity_type}_field_edit_form" are not defined.
+  if (\Drupal::moduleHandler()->moduleExists('field_ui')) {
+    // Add fields entity mappers to all fieldable entity types defined.
+    foreach ($entity_manager->getDefinitions() as $entity_type_id => $entity_type) {
+      $base_route = NULL;
+      try {
+        $base_route = $route_provider->getRouteByName('entity.field_config.' . $entity_type_id . '_field_edit_form');
+      }
+      catch (RouteNotFoundException $e) {
+        // Ignore non-existent routes.
+      }
+
+      // Make sure entity type has field UI enabled and has a base route.
+      if ($entity_type->get('field_ui_base_route') && !empty($base_route)) {
+        $info[$entity_type_id . '_fields'] = array(
+          'base_route_name' => 'entity.field_config.' . $entity_type_id . '_field_edit_form',
+          'entity_type' => 'field_config',
+          'title' => t('!label field'),
+          'class' => '\Drupal\config_translation\ConfigFieldMapper',
+          'base_entity_type' => $entity_type_id,
+          'weight' => 10,
+        );
+      }
+    }
+  }
+}
+
+/**
+ * Alter existing translation tabs for translation of configuration.
+ *
+ * This hook is useful to extend existing configuration mappers with new
+ * configuration names, for example when altering existing forms with new
+ * settings stored elsewhere. This allows the translation experience to also
+ * reflect the compound form element in one screen.
+ *
+ * @param array $info
+ *   An associative array of discovered configuration mappers. Use an entity
+ *   name for the key (for entity mapping) or a unique string for configuration
+ *   name list mapping. The values of the associative array are arrays
+ *   themselves in the same structure as the *.config_translation.yml files.
+ *
+ * @see hook_translation_info()
+ * @see \Drupal\config_translation\ConfigMapperManagerInterface
+ */
+function hook_config_translation_info_alter(&$info) {
+  // Add additional site settings to the site information screen, so it shows
+  // up on the translation screen. (Form alter in the elements whose values are
+  // stored in this config file using regular form altering on the original
+  // configuration form.)
+  $info['system.site_information_settings']['names'][] = 'example.site.setting';
+}
+
+/**
+ * @} End of "addtogroup hooks".
+ */