Accessibility fixes for quick unlock settings.

ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js

Index: ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
diff --git a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
index 3f906ef06ed653a3d999a1a4c1b7f477677667f8..ec26ea2f44148e280e6995ae450822005f4c282d 100644
--- a/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
+++ b/ui/webui/resources/cr_elements/cr_dialog/cr_dialog.js
@@ -15,6 +15,8 @@ Polymer({
   is: 'cr-dialog',
   extends: 'dialog',
 
+  behaviors: [I18nBehavior],
+
   properties: {
     /**
      * True if the dialog should remain open on 'popstate' events. This is used
@@ -53,4 +55,8 @@ Polymer({
   getCloseButton: function() {
     return this.$.close;
   },
+
+  getCloseA11yText_: function() {
+    return this.i18n('close');
+  }
 });