diff --git a/.env.dist b/.env.dist
index d6271d57..726635ba 100644
--- a/.env.dist
+++ b/.env.dist
@@ -3,6 +3,7 @@ APP_ENV=
 SHORTENED_URL_SCHEMA=
 SHORTENED_URL_HOSTNAME=
 SHORTCODE_CHARS=
+DEFAULT_LOCALE=
 
 # Database
 DB_USER=
diff --git a/composer.json b/composer.json
index 0211ed05..b9be6c6d 100644
--- a/composer.json
+++ b/composer.json
@@ -21,10 +21,11 @@
         "zendframework/zend-servicemanager": "^3.0",
         "zendframework/zend-paginator": "^2.6",
         "zendframework/zend-config": "^2.6",
+        "zendframework/zend-i18n": "^2.7",
         "mtymek/expressive-config-manager": "^0.4",
+        "acelaya/zsm-annotated-services": "^0.2.0",
         "doctrine/orm": "^2.5",
         "guzzlehttp/guzzle": "^6.2",
-        "acelaya/zsm-annotated-services": "^0.2.0",
         "symfony/console": "^3.0"
     },
     "require-dev": {
diff --git a/config/autoload/translator.global.php b/config/autoload/translator.global.php
new file mode 100644
index 00000000..e3730927
--- /dev/null
+++ b/config/autoload/translator.global.php
@@ -0,0 +1,8 @@
+<?php
+return [
+
+    'translator' => [
+        'locale' => getenv('DEFAULT_LOCALE') ?: 'en',
+    ],
+
+];
diff --git a/module/CLI/config/translator.config.php b/module/CLI/config/translator.config.php
new file mode 100644
index 00000000..ae120db3
--- /dev/null
+++ b/module/CLI/config/translator.config.php
@@ -0,0 +1,14 @@
+<?php
+return [
+
+    'translator' => [
+        'translation_file_patterns' => [
+            [
+                'type' => 'gettext',
+                'base_dir' => __DIR__ . '/../lang',
+                'pattern' => '%s.mo',
+            ],
+        ],
+    ],
+
+];
diff --git a/module/CLI/lang/es.mo b/module/CLI/lang/es.mo
new file mode 100644
index 00000000..08f58bd9
Binary files /dev/null and b/module/CLI/lang/es.mo differ
diff --git a/module/CLI/lang/es.po b/module/CLI/lang/es.po
new file mode 100644
index 00000000..896f2965
--- /dev/null
+++ b/module/CLI/lang/es.po
@@ -0,0 +1,40 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: Shlink 1.0\n"
+"POT-Creation-Date: 2016-07-21 15:05+0200\n"
+"PO-Revision-Date: 2016-07-21 15:08+0200\n"
+"Last-Translator: \n"
+"Language-Team: \n"
+"Language: es_ES\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"X-Generator: Poedit 1.8.7.1\n"
+"X-Poedit-Basepath: ..\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Poedit-SourceCharset: UTF-8\n"
+"X-Poedit-KeywordsList: translate;translatePlural\n"
+"X-Poedit-SearchPath-0: src\n"
+"X-Poedit-SearchPath-1: config\n"
+
+msgid "Generates a shortcode for provided URL and returns the short URL"
+msgstr "Genera un código corto para la URL proporcionada y devuelve la URL acortada"
+
+msgid "The long URL to parse"
+msgstr "La URL larga a procesar"
+
+msgid "A long URL was not provided. Which URL do you want to shorten?:"
+msgstr "No se ha proporcionado una URL larga. ¿Qué URL deseas acortar?"
+
+msgid "A URL was not provided!"
+msgstr "¡No se ha proporcionado una URL!"
+
+msgid "Processed URL:"
+msgstr "URL procesada:"
+
+msgid "Generated URL:"
+msgstr "URL generada:"
+
+#, php-format
+msgid "Provided URL \"%s\" is invalid. Try with a different one."
+msgstr "La URL proporcionada \"%s\" e inválida. Prueba con una diferente."
diff --git a/module/CLI/src/Command/GenerateShortcodeCommand.php b/module/CLI/src/Command/GenerateShortcodeCommand.php
index 91cbd228..0a0af9eb 100644
--- a/module/CLI/src/Command/GenerateShortcodeCommand.php
+++ b/module/CLI/src/Command/GenerateShortcodeCommand.php
@@ -12,6 +12,7 @@ use Symfony\Component\Console\Input\InputInterface;
 use Symfony\Component\Console\Output\OutputInterface;
 use Symfony\Component\Console\Question\Question;
 use Zend\Diactoros\Uri;
+use Zend\I18n\Translator\TranslatorInterface;
 
 class GenerateShortcodeCommand extends Command
 {
@@ -23,26 +24,37 @@ class GenerateShortcodeCommand extends Command
      * @var array
      */
     private $domainConfig;
+    /**
+     * @var TranslatorInterface
+     */
+    private $translator;
 
     /**
      * GenerateShortcodeCommand constructor.
      * @param UrlShortenerInterface|UrlShortener $urlShortener
+     * @param TranslatorInterface $translator
      * @param array $domainConfig
      *
-     * @Inject({UrlShortener::class, "config.url_shortener.domain"})
+     * @Inject({UrlShortener::class, "translator", "config.url_shortener.domain"})
      */
-    public function __construct(UrlShortenerInterface $urlShortener, array $domainConfig)
-    {
-        parent::__construct(null);
+    public function __construct(
+        UrlShortenerInterface $urlShortener,
+        TranslatorInterface $translator,
+        array $domainConfig
+    ) {
         $this->urlShortener = $urlShortener;
+        $this->translator = $translator;
         $this->domainConfig = $domainConfig;
+        parent::__construct(null);
     }
 
     public function configure()
     {
         $this->setName('shortcode:generate')
-             ->setDescription('Generates a shortcode for provided URL and returns the short URL')
-             ->addArgument('longUrl', InputArgument::REQUIRED, 'The long URL to parse');
+             ->setDescription(
+                 $this->translator->translate('Generates a shortcode for provided URL and returns the short URL')
+             )
+             ->addArgument('longUrl', InputArgument::REQUIRED, $this->translator->translate('The long URL to parse'));
     }
 
     public function interact(InputInterface $input, OutputInterface $output)
@@ -54,9 +66,10 @@ class GenerateShortcodeCommand extends Command
 
         /** @var QuestionHelper $helper */
         $helper = $this->getHelper('question');
-        $question = new Question(
-            '<question>A long URL was not provided. Which URL do you want to shorten?:</question> '
-        );
+        $question = new Question(sprintf(
+            '<question>%s</question> ',
+            $this->translator->translate('A long URL was not provided. Which URL do you want to shorten?:')
+        ));
 
         $longUrl = $helper->ask($input, $output, $question);
         if (! empty($longUrl)) {
@@ -70,7 +83,7 @@ class GenerateShortcodeCommand extends Command
 
         try {
             if (! isset($longUrl)) {
-                $output->writeln('<error>A URL was not provided!</error>');
+                $output->writeln(sprintf('<error>%s</error>', $this->translator->translate('A URL was not provided!')));
                 return;
             }
 
@@ -80,13 +93,16 @@ class GenerateShortcodeCommand extends Command
                 ->withHost($this->domainConfig['hostname']);
 
             $output->writeln([
-                sprintf('Processed URL <info>%s</info>', $longUrl),
-                sprintf('Generated URL <info>%s</info>', $shortUrl),
+                sprintf('%s <info>%s</info>', $this->translator->translate('Processed URL:'), $longUrl),
+                sprintf('%s <info>%s</info>', $this->translator->translate('Generated URL:'), $shortUrl),
             ]);
         } catch (InvalidUrlException $e) {
-            $output->writeln(
-                sprintf('<error>Provided URL "%s" is invalid. Try with a different one.</error>', $longUrl)
-            );
+            $output->writeln(sprintf(
+                '<error>' . $this->translator->translate(
+                    'Provided URL "%s" is invalid. Try with a different one.'
+                ) . '</error>',
+                $longUrl
+            ));
         }
     }
 }
diff --git a/module/Common/config/services.config.php b/module/Common/config/services.config.php
index 838b7896..1423b543 100644
--- a/module/Common/config/services.config.php
+++ b/module/Common/config/services.config.php
@@ -4,7 +4,10 @@ use Doctrine\Common\Cache\Cache;
 use Doctrine\ORM\EntityManager;
 use Shlinkio\Shlink\Common\Factory\CacheFactory;
 use Shlinkio\Shlink\Common\Factory\EntityManagerFactory;
+use Shlinkio\Shlink\Common\Factory\TranslatorFactory;
 use Shlinkio\Shlink\Common\Service\IpLocationResolver;
+use Shlinkio\Shlink\Common\Twig\Extension\TranslatorExtension;
+use Zend\I18n\Translator\Translator;
 use Zend\ServiceManager\Factory\InvokableFactory;
 
 return [
@@ -15,10 +18,13 @@ return [
             GuzzleHttp\Client::class => InvokableFactory::class,
             Cache::class => CacheFactory::class,
             IpLocationResolver::class => AnnotatedFactory::class,
+            Translator::class => TranslatorFactory::class,
+            TranslatorExtension::class => AnnotatedFactory::class,
         ],
         'aliases' => [
             'em' => EntityManager::class,
             'httpClient' => GuzzleHttp\Client::class,
+            'translator' => Translator::class,
             AnnotatedFactory::CACHE_SERVICE => Cache::class,
         ],
     ],
diff --git a/module/Common/config/templates.config.php b/module/Common/config/templates.config.php
new file mode 100644
index 00000000..903c1e8c
--- /dev/null
+++ b/module/Common/config/templates.config.php
@@ -0,0 +1,12 @@
+<?php
+use Shlinkio\Shlink\Common\Twig\Extension\TranslatorExtension;
+
+return [
+
+    'twig' => [
+        'extensions' => [
+            TranslatorExtension::class,
+        ],
+    ],
+
+];
diff --git a/module/Common/src/Factory/TranslatorFactory.php b/module/Common/src/Factory/TranslatorFactory.php
new file mode 100644
index 00000000..e41ba2fc
--- /dev/null
+++ b/module/Common/src/Factory/TranslatorFactory.php
@@ -0,0 +1,30 @@
+<?php
+namespace Shlinkio\Shlink\Common\Factory;
+
+use Interop\Container\ContainerInterface;
+use Interop\Container\Exception\ContainerException;
+use Zend\I18n\Translator\Translator;
+use Zend\ServiceManager\Exception\ServiceNotCreatedException;
+use Zend\ServiceManager\Exception\ServiceNotFoundException;
+use Zend\ServiceManager\Factory\FactoryInterface;
+
+class TranslatorFactory implements FactoryInterface
+{
+    /**
+     * Create an object
+     *
+     * @param  ContainerInterface $container
+     * @param  string $requestedName
+     * @param  null|array $options
+     * @return object
+     * @throws ServiceNotFoundException if unable to resolve the service.
+     * @throws ServiceNotCreatedException if an exception is raised when
+     *     creating a service.
+     * @throws ContainerException if any other error occurs
+     */
+    public function __invoke(ContainerInterface $container, $requestedName, array $options = null)
+    {
+        $config = $container->get('config');
+        return Translator::factory(isset($config['translator']) ? $config['translator'] : []);
+    }
+}
diff --git a/module/Common/src/Twig/Extension/TranslatorExtension.php b/module/Common/src/Twig/Extension/TranslatorExtension.php
new file mode 100644
index 00000000..48ee3f11
--- /dev/null
+++ b/module/Common/src/Twig/Extension/TranslatorExtension.php
@@ -0,0 +1,75 @@
+<?php
+namespace Shlinkio\Shlink\Common\Twig\Extension;
+
+use Acelaya\ZsmAnnotatedServices\Annotation\Inject;
+use Zend\I18n\Translator\TranslatorInterface;
+
+class TranslatorExtension extends \Twig_Extension implements TranslatorInterface
+{
+    /**
+     * @var TranslatorInterface
+     */
+    private $translator;
+
+    /**
+     * TranslatorExtension constructor.
+     * @param TranslatorInterface $translator
+     *
+     * @Inject({"translator"})
+     */
+    public function __construct(TranslatorInterface $translator)
+    {
+        $this->translator = $translator;
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return __CLASS__;
+    }
+
+    public function getFunctions()
+    {
+        return [
+            new \Twig_SimpleFunction('translate', [$this, 'translate']),
+            new \Twig_SimpleFunction('translate_plural', [$this, 'translatePlural']),
+        ];
+    }
+
+    /**
+     * Translate a message.
+     *
+     * @param  string $message
+     * @param  string $textDomain
+     * @param  string $locale
+     * @return string
+     */
+    public function translate($message, $textDomain = 'default', $locale = null)
+    {
+        return $this->translator->translate($message, $textDomain, $locale);
+    }
+
+    /**
+     * Translate a plural message.
+     *
+     * @param  string $singular
+     * @param  string $plural
+     * @param  int $number
+     * @param  string $textDomain
+     * @param  string|null $locale
+     * @return string
+     */
+    public function translatePlural(
+        $singular,
+        $plural,
+        $number,
+        $textDomain = 'default',
+        $locale = null
+    ) {
+        $this->translator->translatePlural($singular, $plural, $number, $textDomain, $locale);
+    }
+}