minor symfony#14087 [Translator] fix test for php 7 compatibility (Tobion)

This PR was merged into the 2.3 branch.

Discussion
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[Translator] fix test for php 7 compatibility

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | symfony#14086 for Translation component
| License       | MIT
| Doc PR        | -

Commits
-------

02b829f [Translator] fix test for php 7 compatibility

Author: fabpot

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

@@ -346,7 +346,7 @@ public function getTransTests()
         return array(
             array('Symfony est super !', 'Symfony is great!', 'Symfony est super !', array(), 'fr', ''),
             array('Symfony est awesome !', 'Symfony is %what%!', 'Symfony est %what% !', array('%what%' => 'awesome'), 'fr', ''),
-            array('Symfony est super !', new String('Symfony is great!'), 'Symfony est super !', array(), 'fr', ''),
+            array('Symfony est super !', new StringClass('Symfony is great!'), 'Symfony est super !', array(), 'fr', ''),
         );
     }
 
@@ -392,7 +392,7 @@ public function getTransChoiceTests()
             array('Il y a 1 pomme', '{0} There are no apples|one: There is one apple|more: There is %count% apples', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 1, array('%count%' => 1), 'fr', ''),
             array('Il y a 10 pommes', '{0} There are no apples|one: There is one apple|more: There is %count% apples', '{0} Il n\'y a aucune pomme|one: Il y a %count% pomme|more: Il y a %count% pommes', 10, array('%count%' => 10), 'fr', ''),
 
-            array('Il y a 0 pomme', new String('{0} There are no appless|{1} There is one apple|]1,Inf] There is %count% apples'), '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 0, array('%count%' => 0), 'fr', ''),
+            array('Il y a 0 pomme', new StringClass('{0} There are no appless|{1} There is one apple|]1,Inf] There is %count% apples'), '[0,1] Il y a %count% pomme|]1,Inf] Il y a %count% pommes', 0, array('%count%' => 0), 'fr', ''),
         );
     }
 
@@ -462,7 +462,7 @@ public function testTransChoiceFallbackWithNoTranslation()
     }
 }
 
-class String
+class StringClass
 {
     protected $str;