diff --git a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
index ffb90d2ed671b..9658d5729c648 100644
--- a/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
+++ b/src/Symfony/Bundle/FrameworkBundle/CHANGELOG.md
@@ -4,6 +4,7 @@ CHANGELOG
 2.5.0
 -----
 
+ * Added `translation:debug` command
  * Added `config:debug` command
  * Added `yaml:lint` command
  * Deprecated the `RouterApacheDumperCommand` which will be removed in Symfony 3.0.
diff --git a/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
new file mode 100644
index 0000000000000..a1f136005336e
--- /dev/null
+++ b/src/Symfony/Bundle/FrameworkBundle/Command/TranslationDebugCommand.php
@@ -0,0 +1,231 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Bundle\FrameworkBundle\Command;
+
+use Symfony\Component\Translation\Catalogue\MergeOperation;
+use Symfony\Component\Console\Helper\Table;
+use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Output\OutputInterface;
+use Symfony\Component\Console\Input\InputArgument;
+use Symfony\Component\Console\Input\InputOption;
+use Symfony\Component\Translation\MessageCatalogue;
+use Symfony\Component\Translation\Translator;
+
+/**
+ * Helps finding unused or missing translation messages in a given locale
+ * and comparing them with the fallback ones.
+ *
+ * @author Florian Voutzinos <florian@voutzinos.com>
+ */
+class TranslationDebugCommand extends ContainerAwareCommand
+{
+    const MESSAGE_MISSING = 0;
+    const MESSAGE_UNUSED = 1;
+    const MESSAGE_EQUALS_FALLBACK = 2;
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function configure()
+    {
+        $this
+            ->setName('translation:debug')
+            ->setDefinition(array(
+                new InputArgument('locale', InputArgument::REQUIRED, 'The locale'),
+                new InputArgument('bundle', InputArgument::REQUIRED, 'The bundle name'),
+                new InputOption('domain', null, InputOption::VALUE_OPTIONAL, 'The messages domain'),
+                new InputOption('only-missing', null, InputOption::VALUE_NONE, 'Displays only missing messages'),
+                new InputOption('only-unused', null, InputOption::VALUE_NONE, 'Displays only unused messages'),
+            ))
+            ->setDescription('Displays translation messages informations')
+            ->setHelp(<<<EOF
+The <info>%command.name%</info> command helps finding unused or missing translation
+messages and comparing them with the fallback ones by inspecting the
+templates and translation files of a given bundle.
+
+You can display information about bundle translations in a specific locale:
+
+<info>php %command.full_name% en AcmeDemoBundle</info>
+
+You can also specify a translation domain for the search:
+
+<info>php %command.full_name% --domain=messages en AcmeDemoBundle</info>
+
+You can only display missing messages:
+
+<info>php %command.full_name% --only-missing en AcmeDemoBundle</info>
+
+You can only display unused messages:
+
+<info>php %command.full_name% --only-unused en AcmeDemoBundle</info>
+EOF
+            )
+        ;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function execute(InputInterface $input, OutputInterface $output)
+    {
+        $locale = $input->getArgument('locale');
+        $domain = $input->getOption('domain');
+        $bundle = $this->getContainer()->get('kernel')->getBundle($input->getArgument('bundle'));
+        $loader = $this->getContainer()->get('translation.loader');
+
+        // Extract used messages
+        $extractedCatalogue = new MessageCatalogue($locale);
+        $this->getContainer()->get('translation.extractor')->extract($bundle->getPath().'/Resources/views', $extractedCatalogue);
+
+        // Load defined messages
+        $currentCatalogue = new MessageCatalogue($locale);
+        if (is_dir($bundle->getPath().'/Resources/translations')) {
+            $loader->loadMessages($bundle->getPath().'/Resources/translations', $currentCatalogue);
+        }
+
+        // Merge defined and extracted messages to get all message ids
+        $mergeOperation = new MergeOperation($extractedCatalogue, $currentCatalogue);
+        $allMessages = $mergeOperation->getResult()->all($domain);
+        if (null !== $domain) {
+            $allMessages = array($domain => $allMessages);
+        }
+
+        // No defined or extracted messages
+        if (empty($allMessages) || null !== $domain && empty($allMessages[$domain])) {
+            $outputMessage = sprintf('<info>No defined or extracted messages for locale "%s"</info>', $locale);
+
+            if (null !== $domain) {
+                $outputMessage .= sprintf(' <info>and domain "%s"</info>', $domain);
+            }
+
+            $output->writeln($outputMessage);
+
+            return;
+        }
+
+        // Load the fallback catalogues
+        $fallbackCatalogues = array();
+        $translator = $this->getContainer()->get('translator');
+        if ($translator instanceof Translator) {
+            foreach ($translator->getFallbackLocales() as $fallbackLocale) {
+                if ($fallbackLocale === $locale) {
+                    continue;
+                }
+
+                $fallbackCatalogue = new MessageCatalogue($fallbackLocale);
+                $loader->loadMessages($bundle->getPath().'/Resources/translations', $fallbackCatalogue);
+                $fallbackCatalogues[] = $fallbackCatalogue;
+            }
+        }
+
+        /** @var \Symfony\Component\Console\Helper\Table $table */
+        $table = new Table($output);
+
+        // Display header line
+        $headers = array('State(s)', 'Id', sprintf('Message Preview (%s)', $locale));
+        foreach ($fallbackCatalogues as $fallbackCatalogue) {
+            $headers[] = sprintf('Fallback Message Preview (%s)', $fallbackCatalogue->getLocale());
+        }
+        $table->setHeaders($headers);
+
+        // Iterate all message ids and determine their state
+        foreach ($allMessages as $domain => $messages) {
+            foreach (array_keys($messages) as $messageId) {
+                $value = $currentCatalogue->get($messageId, $domain);
+                $states = array();
+
+                if ($extractedCatalogue->defines($messageId, $domain)) {
+                    if (!$currentCatalogue->defines($messageId, $domain)) {
+                        $states[] = self::MESSAGE_MISSING;
+                    }
+                } elseif ($currentCatalogue->defines($messageId, $domain)) {
+                    $states[] = self::MESSAGE_UNUSED;
+                }
+
+                if (!in_array(self::MESSAGE_UNUSED, $states) && true === $input->getOption('only-unused')
+                    || !in_array(self::MESSAGE_MISSING, $states) && true === $input->getOption('only-missing')) {
+                    continue;
+                }
+
+                foreach ($fallbackCatalogues as $fallbackCatalogue) {
+                    if ($fallbackCatalogue->defines($messageId, $domain) && $value === $fallbackCatalogue->get($messageId, $domain)) {
+                        $states[] = self::MESSAGE_EQUALS_FALLBACK;
+
+                        break;
+                    }
+                }
+
+                $row = array($this->formatStates($states), $this->formatId($messageId), $this->sanitizeString($value));
+                foreach ($fallbackCatalogues as $fallbackCatalogue) {
+                    $row[] = $this->sanitizeString($fallbackCatalogue->get($messageId, $domain));
+                }
+
+                $table->addRow($row);
+            }
+        }
+
+        $table->render();
+
+        $output->writeln('');
+        $output->writeln('<info>Legend:</info>');
+        $output->writeln(sprintf(' %s Missing message', $this->formatState(self::MESSAGE_MISSING)));
+        $output->writeln(sprintf(' %s Unused message', $this->formatState(self::MESSAGE_UNUSED)));
+        $output->writeln(sprintf(' %s Same as the fallback message', $this->formatState(self::MESSAGE_EQUALS_FALLBACK)));
+    }
+
+    private function formatState($state)
+    {
+        if (self::MESSAGE_MISSING === $state) {
+            return '<fg=red>x</>';
+        }
+
+        if (self::MESSAGE_UNUSED === $state) {
+            return '<fg=yellow>o</>';
+        }
+
+        if (self::MESSAGE_EQUALS_FALLBACK === $state) {
+            return '<fg=green>=</>';
+        }
+
+        return $state;
+    }
+
+    private function formatStates(array $states)
+    {
+        $result = array();
+        foreach ($states as $state) {
+            $result[] = $this->formatState($state);
+        }
+
+        return implode(' ', $result);
+    }
+
+    private function formatId($id)
+    {
+        return sprintf('<fg=cyan;options=bold>%s</fg=cyan;options=bold>', $id);
+    }
+
+    private function sanitizeString($string, $length = 40)
+    {
+        $string = trim(preg_replace('/\s+/', ' ', $string));
+
+        if (function_exists('mb_strlen') && false !== $encoding = mb_detect_encoding($string)) {
+            if (mb_strlen($string, $encoding) > $length) {
+                return mb_substr($string, 0, $length - 3, $encoding).'...';
+            }
+        } elseif (strlen($string) > $length) {
+            return substr($string, 0, $length - 3).'...';
+        }
+
+        return $string;
+    }
+}

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