[Survey] update: User language variable (#11406)

Author: abrahammordev

components/ILIAS/Survey/Participants/class.ilSurveyRaterGUI.php

@@ -130,7 +130,7 @@ public function initOptionSelectForm(): ilPropertyFormGUI
         $radg->addOption($op1);
         $radg->setValue("direct");
 
-        $user = new \ilTextInputGUI($lng->txt("obj_user"), "user");
+        $user = new \ilTextInputGUI($lng->txt("username"), "user");
         $user->setDataSource(
             $ctrl->getLinkTargetByClass(
                 "ilsurveyratergui",