adds in aria attributes and semantic status content for vsepr input problems

common/lib/capa/capa/templates/vsepr_input.html

@@ -21,11 +21,11 @@
     <div class="incorrect" id="status_${id}">
     % endif
 
-  <input type="text" name="input_${id}" id="input_${id}" value="${value|h}"
+  <input type="text" name="input_${id}" id="input_${id}" aria-describedby="answer_${id}" value="${value|h}"
       style="display:none;"
    />
 
-      <p class="status">
+      <p class="status" aria-describedby="input_${id}">
         % if status == 'unsubmitted':
         unanswered
         % elif status == 'correct':