add a heading for the table

resource/locales/ja/translation.json

@@ -110,6 +110,7 @@
   "Specified users": "特定ユーザーのみ",
   "Just me": "自分のみ",
   "Only inside the group": "特定グループのみ",
+  "Page list and search results": "ページリスト・検索結果",
   "Scope of page showing": "ページの公開範囲",
   "Set point": "設定値",
   "Always displayed": "表示(固定)",

src/client/js/components/Admin/Security/SecuritySetting.jsx

@@ -59,6 +59,7 @@ class SecuritySetting extends React.Component {
           )}
 
         <table className="table col-md-8 m-3">
+        <h4>{ t('Page list and search results') }</h4>
           <thead>
             <tr>
               <th scope="col">{ t('Scope of page showing') }</th>