Language selection on config screen

src/Wallabag/CoreBundle/DependencyInjection/Configuration.php

@@ -0,0 +1,25 @@
+<?php
+
+namespace Wallabag\CoreBundle\DependencyInjection;
+
+use Symfony\Component\Config\Definition\Builder\TreeBuilder;
+use Symfony\Component\Config\Definition\ConfigurationInterface;
+
+class Configuration implements ConfigurationInterface
+{
+    public function getConfigTreeBuilder()
+    {
+        $treeBuilder = new TreeBuilder();
+        $rootNode = $treeBuilder->root('wallabag_core');
+
+        $rootNode
+            ->children()
+                ->arrayNode('languages')
+                    ->prototype('scalar')->end()
+                ->end()
+            ->end()
+        ;
+
+        return $treeBuilder;
+    }
+}

src/Wallabag/CoreBundle/DependencyInjection/WallabagCoreExtension.php

@@ -11,6 +11,10 @@ class WallabagCoreExtension extends Extension
 {
     public function load(array $configs, ContainerBuilder $container)
     {
+        $configuration = new Configuration();
+        $config = $this->processConfiguration($configuration, $configs);
+        $container->setParameter('wallabag_core.languages', $config['languages']);
+
         $loader = new Loader\YamlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.yml');
     }