[Translation] Modified Translation unit test "testTransWithFallbackLocale"

Now the test shows the behavior when is requested a translation to an undefined locale catalogue and, therefore, the fallbacklocale catalogue must be queried. The original test function only checks the step to reach the language catalog not to the fallbacklocale one (even the fallbacklocale isn't set). This test gives error in the current version of symfony/symfony.

tests/Symfony/Tests/Component/Translation/TranslatorTest.php

@@ -43,11 +43,13 @@ class TranslatorTest extends \PHPUnit_Framework_TestCase
 
     public function testTransWithFallbackLocale()
     {
-        $translator = new Translator('en_US', new MessageSelector());
+        $translator = new Translator('fr_FR', new MessageSelector());
         $translator->addLoader('array', new ArrayLoader());
         $translator->addResource('array', array('foo' => 'foofoo'), 'en_US');
         $translator->addResource('array', array('bar' => 'foobar'), 'en');
 
+        $translator->setFallbackLocale('en');
+
         $this->assertEquals('foobar', $translator->trans('bar'));
     }