MAGETWO-43571: i18n:collect phrases does not follow symlinks

Author: arkadiych

setup/src/Magento/Setup/Module/I18n/FilesCollector.php

@@ -42,7 +42,7 @@ protected function _getIterator($path, $fileMask = false)
         try {
             $directoryIterator = new \RecursiveDirectoryIterator(
                 $path,
-                \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::UNIX_PATHS
+                \FilesystemIterator::SKIP_DOTS | \FilesystemIterator::UNIX_PATHS | \FilesystemIterator::FOLLOW_SYMLINKS
             );
             $iterator = new \RecursiveIteratorIterator($directoryIterator);
         } catch (\UnexpectedValueException $valueException) {