Issue 2202 - Changed label "Share these numbers" to "Share this number" in the icon popup

_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 148 matching lines @@
     "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.",
     "placeholders": {
       "number": {
         "content": "$1"
       }
     }
   },
   "stats_share_title": {
     "description": "Label for social media buttons sharing the number of blocked ads",
-    "message": "Share these numbers"
+    "message": "Share this number"
   },
   "stats_show_iconnumber": {
     "description": "Toggle for displaying the number of blocked ads in the icon.",
     "message": "Show number in icon"
   },
   "stats_title": {
     "description": "Title for the stats section in the popup.",
     "message": "Ads blocked"
   },
   "subscriptionSelection_subscriptionSelector_label": {
@@ skipping 21 matching lines @@
   "line": {
     "message": "Line $number$",
     "description": "Prepended to error messages to indicate the line number (e.g. \"Line 42: Some error on this line\")",
     "placeholders": {
       "number": {
         "content": "$1"
       }
     }
   }
 }