Added ad counting functionality

_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 113 matching lines @@
   "stats_over": {
     "description": "For some numbers the stats share message will say 'I blocked over 123 ads' instead of 'I blocked 123 ads'. This is a reference to the 'over 9000' meme. This string can be translated simply with '$number$' if that meme isn't known to the speakers of the language or if the resulting sentence would sound weird otherwise.",
     "message": "over $number$",
     "placeholders": {
       "number": {
         "content": "$1"
       }
     }
   },
   "stats_share_download": {
-    "description": "Label for link to adblockplus.org",
+    "description": "Label for link to adblockplus.org that is attached when the user wants to share the stats on Facebook.",
     "message": "Download Adblock Plus"
   },
   "stats_share_label_fb": {
     "message": "Share on Facebook"
   },
   "stats_share_label_gplus": {
     "message": "Share on Google+"
   },
   "stats_share_label_twitter": {
     "message": "Share on Twitter"
   },
   "stats_share_message": {
     "description": "This message will be posted to social networks if the user decides to share the stats.",
-    "message": "I blocked $number$ ads and trackers thanks to Adblock Plus",

[Wladimir Palant, 2013/09/18 09:56:48]

This sentence still needs a period at the end.

+    "message": "I blocked $number$ ads and trackers thanks to Adblock Plus.",
     "placeholders": {
       "number": {
         "content": "$1"
       }
     }
   },
   "stats_share_title": {
     "description": "Label for the action in the popup which presents the user with all sharing options.",
     "message": "Share this"
   },
   "stats_title": {
     "description": "Title for the stats section in the popup.",
     "message": "Blocked ads:"
   },
   "subscriptionSelection_subscriptionSelector_label": {
     "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"
   }
 }