Issue 2357 - Added "predefined list" dialog to options page

locale/en-US/options.json

 {
   "options_page_title": {
     "description": "Options page title",
     "message": "Adblock Plus Options"
   },
   "options_page_header_1": {
     "description": "Page title in navigation sidebar",
     "message": "Options"
   },
   "options_page_header_2": {
@@ skipping 145 matching lines @@
     "message": "Adblock Plus support forum"
   },
   "options_media_title": {
     "description": "Social media Section name in Help tab",
     "message": "Social media"
   },
   "options_media_description": {
     "description": "Social media section description in Help tab",
     "message": "If there are major problems with Adblock Plus which affects all of our users, we tell you in our social media channels."
   },
+  "options_dialog_addSubscription_confirm": {
+    "description": "Confirming to add a predefined subscription",
+    "message": "Yes, use this blocking list"
+  },
+  "options_dialog_addSubscription_title": {
+    "description": "Dialog title for adding a predefined subscription",
+    "message": "Do you really want to use this blocking list?"
+  },
   "options_dialog_customlist_title": {
     "description": "Title of custom list modal dialog",
     "message": "Add other blocking list"
   },
   "options_close": {
     "description": "Close modal button",
     "message": "close"
   },
   "options_dialog_customlist_subscription_title": {
     "description": "Add customlist modal import hint message",
@@ skipping 81 matching lines @@
   },
   "options_language_ro": {
     "description": "Language name shown in add language modal dialog",
     "message": "Romanian"
   },
   "options_language_ru_uk": {
     "description": "Language name shown in add language modal dialog",
     "message": "Russian and Ukrainian"
   }
 }