[$csp4 adblockpluschrome] Issue 5241 - Add support for Content Security Policy filters

_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 47 matching lines @@
   },
   "filter_elemhideemulation_nodomain": {
     "message": "No active domain specified for extended element hiding filter"
   },
   "filter_invalid_domain": {
     "message": "Invalid (or empty) domain specified"
   },
   "filter_invalid_regexp": {
     "message": "Invalid regular expression"
   },
+  "filter_invalid_csp": {
+    "message": "Invalid Content Security Policy"
+  },
   "filter_lists": {
     "description": "This is a tab heading.",
     "message": "Filter lists"
   },
   "filter_must_follow_syntax": {
     "message": "Your filter must follow the <a>Adblock Plus filter syntax</a>."
   },
   "filter_unknown_option": {
     "message": "Unknown filter option"
   },
@@ skipping 201 matching lines @@
     }
   },
   "continue": {
     "description": "Continue button label",
     "message": "Continue"
   },
   "sendReport": {
     "message": "Report issue on this page"
   }
 }