Do not log or call the proxy function when the locale is the same

src/Symfony/Component/Translation/LoggingTranslator.php

@@ -84,6 +84,10 @@ class LoggingTranslator implements TranslatorInterface, LegacyTranslatorInterfac
     {
         $prev = $this->translator->getLocale();
         $this->translator->setLocale($locale);
+        if ($prev === $locale) {
+            return;
+        }
+
         $this->logger->debug(sprintf('The locale of the translator has changed from "%s" to "%s".', $prev, $locale));
     }