Issue 1623 - Removed unused/duplicate translations

_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 26 matching lines @@
     "message": "The free adblock tool for Opera: Blocks annoying video ads on YouTube, Facebook ads, banners and much more."
   },
   "description_safari": {
     "message": "The free adblock tool for Safari: Blocks annoying video ads on YouTube, Facebook ads, banners and much more."
   },
   "disabled_for_site":
   {
     "description": "Popup balloon label to disable blocking",
     "message": "<strong>Disabled</strong> on this site"
   },
-  "disable_inline": {
-    "message": "Disable inline text ads"
-  },
   "disabled_for_these_domains": {
     "message": "Adblock Plus is disabled for the domains listed below. You can add a domain either via the Adblock Plus icon in the address bar or by typing the domain (not a URL) in the box and clicking the \"Add domain\" button."
   },
   "easy_create_filter": {
     "description": "Popup balloon label for blocking elements on the current page",
     "message": "Block element"
   },
   "edit_filters_raw": {
     "message": "Edit filters as raw text"
   },
@@ skipping 142 matching lines @@
   "line": {
     "message": "Line $number$",
     "description": "Prepended to error messages to indicate the line number (e.g. \"Line 42: Some error on this line\")",
     "placeholders": {
       "number": {
         "content": "$1"
       }
     }
   }
 }