Add Yandex translator support (#151)

* Allow Yandex translator to be specified

* Declare service for Yandex translator

* Removed bing

Author: bocharsky-bw

DependencyInjection/Configuration.php

@@ -182,7 +182,7 @@ private function addAutoTranslateNode(ArrayNodeDefinition $root)
             ->arrayNode('fallback_translation')
                 ->canBeEnabled()
                 ->children()
-                    ->enumNode('service')->values(['google', 'bing'])->defaultValue('google')->end()
+                    ->enumNode('service')->values(['google', 'yandex'])->defaultValue('google')->end()
                     ->scalarNode('api_key')->defaultNull()->end()
                 ->end()
             ->end()

Resources/config/auto_translation.yml

@@ -19,3 +19,7 @@ services:
   php_translation.translator_service.google:
      class: Translation\Translator\Service\GoogleTranslator
      arguments: ["%php_translation.translator_service.api_key%"]
+
+  php_translation.translator_service.yandex:
+     class: Translation\Translator\Service\YandexTranslator
+     arguments: ["%php_translation.translator_service.api_key%"]