Issue 5880 - Basic issue reporter implementation

_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 352 matching lines @@
   },
   "issueReporter_doneButton_label": {
     "message": "Done"
   },
   "issueReporter_confirmationMessage": {
     "message": "Your report has been saved. You can access it at the following address:"
   },
   "issueReporter_knownIssueMessage": {
     "message": "The issue you reported is probably already known. More information:"
   },
+  "issueReporter_errorMessage": {
+    "message": "An attempt to send the report failed with error code \"?1?\". Please ensure you are connected to the Internet and retry. If the problem persists please request assistance in the [link]Adblock Plus forum[/link]."
+  },
   "issueReporter_privacyPolicy": {
     "message": "Privacy policy"
   }
 }