[Translation] avoid creating cache files for fallback locales.

Author: aitboudad

Tests/TranslatorCacheTest.php

@@ -149,6 +149,17 @@ public function testDifferentTranslatorsForSameLocaleDoNotOverwriteEachOthersCac
         $this->assertEquals('OK', $translator->trans($msgid), '-> the cache was overwritten by another translator instance in '.($debug ? 'debug' : 'production'));
     }
 
+    public function testGeneratedCacheFilesAreOnlyBelongRequestedLocales()
+    {
+        $translator = new Translator('a', null, $this->tmpDir);
+        $translator->setFallbackLocales(array('b'));
+        $translator->trans('bar');
+
+        $cachedFiles = glob($this->tmpDir.'/*.php');
+
+        $this->assertCount(1, $cachedFiles);
+    }
+
     public function testDifferentCacheFilesAreUsedForDifferentSetsOfFallbackLocales()
     {
         /*

Translator.php

@@ -420,7 +420,7 @@ private function loadFallbackCatalogues($locale)
 
         foreach ($this->computeFallbackLocales($locale) as $fallback) {
             if (!isset($this->catalogues[$fallback])) {
-                $this->loadCatalogue($fallback);
+                $this->initializeCatalogue($fallback);
             }
 
             $fallbackCatalogue = new MessageCatalogue($fallback, $this->catalogues[$fallback]->all());