document reset

Co-authored-by: Maxime Doutreluingne <maxime.doutreluingne@gmail.com>

Author: kbond

translation.rst

@@ -866,7 +866,9 @@ services::
             // (from now on, the application will use 'fr' (French) as the
             // locale; including the default locale used to translate Twig templates)
             $this->localeSwitcher->setLocale('fr');
-
+            // reset the current locale of your application to the configured default locale
+            // in config/packages/translation.yaml, by option 'default_locale'
+            $this->localeSwitcher->reset();
             // you can also run some code with a certain locale, without
             // changing the locale for the rest of the application
             $this->localeSwitcher->runWithLocale('es', function() {