[Contracts] Add missing return types

Author: nicolas-grekas

Service/ResetInterface.php

@@ -26,5 +26,8 @@
  */
 interface ResetInterface
 {
+    /**
+     * @return void
+     */
     public function reset();
 }

Translation/LocaleAwareInterface.php

@@ -16,6 +16,8 @@ interface LocaleAwareInterface
     /**
      * Sets the current locale.
      *
+     * @return void
+     *
      * @throws \InvalidArgumentException If the locale contains invalid characters
      */
     public function setLocale(string $locale);