minor #14549 [Translation] simplify getMessages. (aitboudad)

This PR was merged into the 2.6 branch.

Discussion
----------

[Translation] simplify getMessages.

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

Commits
-------

db077c1 [Translation] simplify getMessages.

Translator.php

@@ -273,15 +273,10 @@ protected function getLoaders()
      */
     public function getMessages($locale = null)
     {
-        $catalogues = array();
-        $catalogues[] = $catalogue = $this->getCatalogue($locale);
+        $catalogue = $this->getCatalogue($locale);
+        $messages = $catalogue->all();
         while ($catalogue = $catalogue->getFallbackCatalogue()) {
-            $catalogues[] = $catalogue;
-        }
-        $messages = array();
-        for ($i = count($catalogues) - 1; $i >= 0; $i--) {
-            $localeMessages = $catalogues[$i]->all();
-            $messages = array_replace_recursive($messages, $localeMessages);
+            $messages = array_replace_recursive($catalogue->all(), $messages);
         }
 
         return $messages;