Issue 3880 - Improve behavior of Safari content blocker option

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 137 matching lines @@
     "message": "Show 'Adblock Plus' panel in the developer tools"
   },
   "options_tweaks_showNotifications": {
     "description": "Notification opt-out option in Advanced tab",
     "message": "Show useful notifications"
   },
   "options_tweaks_safariContentBlocker": {
     "description": "Switch between classic and Safari's Content Blocking",
     "message": "Use Safari's native Content Blocking (experimental)"
   },
+  "options_tweaks_restartSafari": {
+    "description": "Shown next to the option for Safai Content Blockers if disabled in order to indicate that a restart is required",
+    "message": "Please restart Safari"
+  },
   "options_filterList_title": {
     "description": "Section title in Advanced tab",
     "message": "Filter lists"
   },
   "options_tab_overview": {
     "description": "Tab name in Advanced tab",
     "message": "Overview"
   },
   "options_tab_ownList": {
     "description": "Tab name in Advanced tab",
@@ skipping 221 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"
   }
 }