bug 432039 - Accessibility fixes in mail/extensions/smime XUL files

r=philringnalda

mail/extensions/smime/content/am-smime.xul

@@ -45,6 +45,7 @@
 
 <page xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul"
         class="color-dialog"
+        title="&securityTitle.label;"
         onload="parent.onPanelLoaded('am-smime.xul');"
         orient="vertical">
  
@@ -102,7 +103,7 @@
 
     <separator class="thin"/>
 
-    <label value="&encryptionChoiceLabel.label;"/>
+    <label value="&encryptionChoiceLabel.label;" control="encryptionChoices"/>
 
     <radiogroup id="encryptionChoices">
       <radio id="encrypt_mail_never" wsm_persist="true" value="0"

mail/extensions/smime/content/msgCompSecurityInfo.xul

@@ -75,7 +75,7 @@
   </grid>
 
   <separator class="thin"/>
-  <label value="&status.certificates;"/>
+  <label value="&status.certificates;" control="infolist"/>
 
   <listbox id="infolist" flex="1"
         onselect="onSelectionChange(event);">