feature #20547 [FrameworkBundle] Allowed symlinks when searching for …

…translation, searialization and validation files (tifabien)

This PR was squashed before being merged into the 3.3-dev branch (closes #20547).

Discussion
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[FrameworkBundle] Allowed symlinks when searching for translation, searialization and validation files

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

When we have a symlink folder in app/Resources/translations, files inside this symlink are not handled.

Commits
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4874e43 [FrameworkBundle] Allowed symlinks when searching for translation, searialization and validation files

src/Symfony/Bundle/FrameworkBundle/DependencyInjection/FrameworkExtension.php

@@ -893,6 +893,7 @@ private function registerTranslatorConfiguration(array $config, ContainerBuilder
 
             $files = array();
             $finder = Finder::create()
+                ->followLinks()
                 ->files()
                 ->filter(function (\SplFileInfo $file) {
                     return 2 === substr_count($file->getBasename(), '.') && preg_match('/\.\w+$/', $file->getBasename());
@@ -1004,10 +1005,10 @@ private function getValidatorMappingFiles(ContainerBuilder $container)
             }
 
             if (is_dir($dir = $dirname.'/Resources/config/validation')) {
-                foreach (Finder::create()->files()->in($dir)->name('*.xml') as $file) {
+                foreach (Finder::create()->followLinks()->files()->in($dir)->name('*.xml') as $file) {
                     $files[0][] = $file->getPathname();
                 }
-                foreach (Finder::create()->files()->in($dir)->name('*.yml') as $file) {
+                foreach (Finder::create()->followLinks()->files()->in($dir)->name('*.yml') as $file) {
                     $files[1][] = $file->getPathname();
                 }
 
@@ -1187,13 +1188,13 @@ private function registerSerializerConfiguration(array $config, ContainerBuilder
             }
 
             if (is_dir($dir = $dirname.'/Resources/config/serialization')) {
-                foreach (Finder::create()->files()->in($dir)->name('*.xml') as $file) {
+                foreach (Finder::create()->followLinks()->files()->in($dir)->name('*.xml') as $file) {
                     $definition = new Definition('Symfony\Component\Serializer\Mapping\Loader\XmlFileLoader', array($file->getPathname()));
                     $definition->setPublic(false);
 
                     $serializerLoaders[] = $definition;
                 }
-                foreach (Finder::create()->files()->in($dir)->name('*.yml') as $file) {
+                foreach (Finder::create()->followLinks()->files()->in($dir)->name('*.yml') as $file) {
                     $definition = new Definition('Symfony\Component\Serializer\Mapping\Loader\YamlFileLoader', array($file->getPathname()));
                     $definition->setPublic(false);