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

core/lib/Drupal/Core/Transliteration/PhpTransliteration.php

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+<?php
+
+/**
+ * @file
+ * Contains \Drupal\Core\Transliteration\PhpTransliteration.
+ */
+
+namespace Drupal\Core\Transliteration;
+
+use Drupal\Component\Transliteration\PhpTransliteration as BaseTransliteration;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+
+/**
+ * Enhances PhpTransliteration with an alter hook.
+ *
+ * @ingroup transliteration
+ * @see hook_transliteration_overrides_alter()
+ */
+class PhpTransliteration extends BaseTransliteration {
+
+  /**
+   * The module handler to execute the transliteration_overrides alter hook.
+   *
+   * @var \Drupal\Core\Extension\ModuleHandlerInterface
+   */
+  protected $moduleHandler;
+
+  /**
+   * Constructs a PhpTransliteration object.
+   *
+   * @param string $data_directory
+   *   (optional) The directory where data files reside. If omitted, defaults
+   *   to subdirectory 'data' underneath the directory where the class's PHP
+   *   file resides.
+   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
+   *   The module handler to execute the transliteration_overrides alter hook.
+   */
+  public function __construct($data_directory = NULL, ModuleHandlerInterface $module_handler) {
+    parent::__construct($data_directory);
+
+    $this->moduleHandler = $module_handler;
+  }
+
+  /**
+   * Overrides \Drupal\Component\Transliteration\PhpTransliteration::readLanguageOverrides().
+   *
+   * Allows modules to alter the language-specific $overrides array by invoking
+   * hook_transliteration_overrides_alter().
+   */
+  protected function readLanguageOverrides($langcode) {
+    parent::readLanguageOverrides($langcode);
+
+    // Let modules alter the language-specific overrides.
+    $this->moduleHandler->alter('transliteration_overrides', $this->languageOverrides[$langcode], $langcode);
+  }
+
+}