[Translation] Silence error when intl not loaded

Fix issue 1505 from Symfony Demo

symfony/demo#1505

Author: smnandre

LocaleSwitcher.php

@@ -34,9 +34,14 @@ public function __construct(
 
     public function setLocale(string $locale): void
     {
-        if (class_exists(\Locale::class)) {
-            \Locale::setDefault($locale);
+        // Silently ignore if the intl extension is not loaded
+        try {
+            if (class_exists(\Locale::class, false)) {
+                \Locale::setDefault($locale);
+            }
+        } catch (\Exception) {
         }
+
         $this->locale = $locale;
         $this->requestContext?->setParameter('_locale', $locale);