Used twig extension to load translations on twig templates

module/Core/config/translator.config.php

@@ -0,0 +1,14 @@
+<?php
+return [
+
+    'translator' => [
+        'translation_file_patterns' => [
+            [
+                'type' => 'gettext',
+                'base_dir' => __DIR__ . '/../lang',
+                'pattern' => '%s.mo',
+            ],
+        ],
+    ],
+
+];

module/Core/lang/es.po

@@ -0,0 +1,35 @@
+msgid ""
+msgstr ""
+"Project-Id-Version: Shlink 1.0\n"
+"POT-Creation-Date: 2016-07-21 16:50+0200\n"
+"PO-Revision-Date: 2016-07-21 16:51+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;translaePlural;translate_plural\n"
+"X-Poedit-SearchPath-0: templates\n"
+"X-Poedit-SearchPath-1: config\n"
+"X-Poedit-SearchPath-2: src\n"
+
+msgid "Make sure you included all the characters, with no extra punctuation."
+msgstr "Asegúrate de haber incluído todos los caracteres, sin puntuación extra."
+
+msgid "Oops!"
+msgstr "¡Vaya!"
+
+msgid "This short URL doesn't seem to be valid."
+msgstr "Esta URL acortada no parece ser válida."
+
+msgid "URL Not Found"
+msgstr "URL no encontrada"
+
+#, php-format
+msgid "We encountered a %s %s error."
+msgstr "Hemos encontrado un error %s %s."

module/Core/templates/core/error/404.html.twig

@@ -1,6 +1,6 @@
 {% extends 'core/layout/default.html.twig' %}
 
-{% block title %}URL Not Found{% endblock %}
+{% block title %}{{ translate('URL Not Found') }}{% endblock %}
 
 {% block stylesheets %}
     <style>
@@ -10,8 +10,8 @@
 {% endblock %}
 
 {% block content %}
-    <h1>Oops!</h1>
+    <h1>{{ translate('Oops!') }}</h1>
     <hr>
-    <p>This short URL doesn't seem to be valid.</p>
-    <p>Make sure you included all the characters, with no extra punctuation.</p>
+    <p>{{ translate('This short URL doesn\'t seem to be valid.') }}</p>
+    <p>{{ translate('Make sure you included all the characters, with no extra punctuation.') }}</p>
 {% endblock %}

module/Core/templates/core/error/error.html.twig

@@ -10,11 +10,11 @@
 {% endblock %}
 
 {% block content %}
-    <h1>Oops!</h1>
+    <h1>{{ translate('Oops!') }}</h1>
     <hr>
-    <p>We encountered a {{ status }} {{ reason }} error.</p>
+    <p>{{ translate('We encountered a %s %s error.') | format(status, reason) }}</p>
     {% if status == 404 %}
-        <p>This short URL doesn't seem to be valid.</p>
-        <p>Make sure you included all the characters, with no extra punctuation.</p>
+        <p>{{ translate('This short URL doesn\'t seem to be valid.') }}</p>
+        <p>{{ translate('Make sure you included all the characters, with no extra punctuation.') }}</p>
     {% endif %}
 {% endblock %}