refactor: improve property checks

- use ClassUtils for real class name resolution in ActivityType

src/Bundle/ChillMainBundle/Templating/TranslatableStringTwig.php

@@ -42,10 +42,8 @@ class TranslatableStringTwig extends AbstractExtension
 
     /**
      * Returns the name of the extension.
-     *
-     * @return The name of the extension
      */
-    public function getName()
+    public function getName(): string
     {
         return 'chill_main_localize';
     }