[TranslationDebug] workaround for getFallbackLocales.

src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php

@@ -19,6 +19,8 @@ use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Translation\MessageCatalogue;
 use Symfony\Component\Translation\Translator;
+use Symfony\Component\Translation\DataCollectorTranslator;
+use Symfony\Component\Translation\LoggingTranslator;
 
 /**
  * Helps finding unused or missing translation messages in a given locale
@@ -157,7 +159,7 @@ EOF
         // Load the fallback catalogues
         $fallbackCatalogues = array();
         $translator = $this->getContainer()->get('translator');
-        if ($translator instanceof Translator) {
+        if ($translator instanceof Translator || $translator instanceof DataCollectorTranslator || $translator instanceof LoggingTranslator) {
             foreach ($translator->getFallbackLocales() as $fallbackLocale) {
                 if ($fallbackLocale === $locale) {
                     continue;

src/Symfony/Component/Translation/DataCollectorTranslator.php

@@ -88,6 +88,20 @@ class DataCollectorTranslator implements TranslatorInterface, TranslatorBagInter
         return $this->translator->getCatalogue($locale);
     }
 
+    /**
+     * Gets the fallback locales.
+     *
+     * @return array $locales The fallback locales
+     */
+    public function getFallbackLocales()
+    {
+        if ($this->translator instanceof Translator) {
+            return $this->translator->getFallbackLocales();
+        }
+
+        return array();
+    }
+
     /**
      * Passes through all unknown calls onto the translator object.
      */

src/Symfony/Component/Translation/LoggingTranslator.php

@@ -88,6 +88,20 @@ class LoggingTranslator implements TranslatorInterface, TranslatorBagInterface
         return $this->translator->getCatalogue($locale);
     }
 
+    /**
+     * Gets the fallback locales.
+     *
+     * @return array $locales The fallback locales
+     */
+    public function getFallbackLocales()
+    {
+        if ($this->translator instanceof Translator) {
+            return $this->translator->getFallbackLocales();
+        }
+
+        return array();
+    }
+
     /**
      * Passes through all unknown calls onto the translator object.
      */