Allow trigger node to use other than msg.topic to separate streams

and add test

packages/node_modules/@node-red/nodes/locales/ja/messages.json

@@ -302,7 +302,7 @@
         "wait-for": "指定した時間待機",
         "wait-loop": "指定した時間間隔毎に送信を繰り返す",
         "for": "処理対象",
-        "bytopics": "msg.topic毎",
+        "bytopics": "毎",
         "alltopics": "全メッセージ",
         "duration": {
             "ms": "ミリ秒",