Add more feedback for instructors on Student Admin section of the dash.

lms/templates/instructor/instructor_dashboard_2/student_admin.html

@@ -29,9 +29,11 @@
   -->
 
   <hr>
+</div>
 
+<div class="student-grade-container action-type-container">
   <h2>${_("Student-specific grade adjustment")}</h2>
-
+  <div class="request-response-error"></div>
   <p>
     <!-- Doesn't work for username but this MUST work -->
   ${_("Specify the {platform_name} email address or username of a student here:").format(platform_name=settings.PLATFORM_NAME)}