Add no results string

public/locales/en/common.json

@@ -487,6 +487,7 @@
       "start_typing": "Start typing the name of a {{object}}",
       "min_length": "Type at least 3 characters",
       "no_results": "No results found for '{{query}}'",
+      "no_results_generic": "No results found",
       "end_results": "No more results"
     },
     "placeholders": {

public/locales/ja/common.json

@@ -485,6 +485,7 @@
       "start_typing": "{{object}}名を入力してください",
       "min_length": "3文字以上を入力してください",
       "no_results": "'{{query}}'の検索結果が見つかりませんでした",
+      "no_results_generic": "検索結果が見つかりませんでした",
       "end_results": "検索結果これ以上ありません"
     },
     "placeholders": {