Fix: Notification popup is broken

_locales/en_US/messages.json

 {
   "add": {
     "description": "This is the label for the 'Add' buttons.",
     "message": "Add"
   },
   "add_domain_button": {
     "message": "Add domain"
   },
   "add_filter_button": {
     "message": "Add filter"
@@ skipping 11 matching lines @@
     "description": "Label for 'Block Element' context menu item",
     "message": "Block Element"
   },
   "cancel": {
     "description": "Cancel button label",
     "message": "Cancel"
   },
   "clickhide_instructions": {
     "message": "After closing this popup, click (or right-click) an element on the page."
   },
+  "confirm_window_notification": {
+    "message": "Click 'OK' to open the links in this notification."
+  },
   "description_chrome": {
     "description": "Note: this cannot be longer than 132 characters",
     "message": "The free adblock tool for Chrome: Blocks annoying video ads on YouTube, Facebook ads, banners and much more."
   },
   "description_opera": {
     "message": "The free adblock tool for Opera: Blocks annoying video ads on YouTube, Facebook ads, banners and much more."
   },
   "description_safari": {
     "message": "The free adblock tool for Safari: Blocks annoying video ads on YouTube, Facebook ads, banners and much more."
   },
@@ skipping 130 matching lines @@
     "message": "Please choose a filter subscription from the list:"
   },
   "update_now": {
     "message": "Update now"
   },
   "whitelisted_domains": {
     "description": "This is a tab heading.",
     "message": "Whitelisted domains"
   }
 }