Issue 2101 - Avoid duplicate interface page strings.

locales/en/IAdblockPlusSubscription.json

 {
   "title": {
     "message": "IAdblockPlusSubscription"
   },
   "s1": {
     "message": "This interface represents a group in the Adblock Plus preferences dialog, it is returned by <a>IAdblockPlus</a>. All access is read-only."
   },
   "s2": {
     "message": "<em>Note</em>: You should not keep a reference to this object. If you need the state of the same subscription at a later point in time you should request it again from IAdblockPlus to get correct information."
   },
@@ skipping 97 matching lines @@
     "message": "Last-Modified"
   },
   "lastModifiedDescription-s3": {
     "message": "HTTP header received with the last successful download. This isn't used yet and will always be empty."
   },
   "getPatternsDescription-s1": {
     "message": "Retrieves the list of filter rules for a subscription. Note that this method usually will not return anything useful for special groups."
   },
   "getPatterns_returnDescription-s1": {
     "message": "array with subscription's filter rules"
-  },
-  "general_notes": {
-    "message": "General notes"
-  },
-  "toc_header": {
-    "message": "Methods and properties"
   }
 }