fix Japanese search result translation (#2149)

add 'result' mean, '件' only mean count unit.

app/assets/javascripts/components/locales/ja.jsx

@@ -110,7 +110,7 @@ const ja = {
   "report.target": "問題のユーザー",
   "search.placeholder": "検索",
   "search.status_by": "{name}からの投稿",
-  "search_results.total": "{count, number} 件",
+  "search_results.total": "{count, number} 件の結果",
   "status.delete": "削除",
   "status.favourite": "お気に入り",
   "status.load_more": "もっと見る",