Issue 2747 - Added empty state for tables in 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 85 matching lines @@
     "message": "The Acceptable Ads initiative, which supports both users and website owners, is a set of strict guidelines that identifies acceptable ads. Ads meeting these criteria are displayed to users."
   },
   "options_acceptableAds_title_tooltip_3": {
     "description": "Third part of tooltip description for 'Acceptable Ads' section in General tab",
     "message": "You can, however, disable this feature at any time and browse ad-free."
   },
   "options_acceptableAds_description": {
     "description": "Acceptable ads descriptive name in General tab",
     "message": "Allow some non-intrusive advertising"
   },
+  "options_whitelisted_add": {
+    "description": "Button label for adding whitelisted website",
+    "message": "add website"
+  },
   "options_whitelisted_empty": {
     "description": "Text shown when list of whitelisted websites is empty",
     "message": "There are no websites in your whitelist."
   },
   "options_whitelisted_title": {
     "description": "Whitelisting option name in General tab",
     "message": "Whitelisted websites"
   },
   "options_whitelisted_title_tooltip_1": {
     "description": "First top part of tooltip description for 'Whitelisted domains' section in General tab",
@@ skipping 217 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"
   }
 }