add i18n support adn English and Japanese message

packages/node_modules/@node-red/editor-client/locales/en-US/editor.json

@@ -1158,7 +1158,8 @@
     "tourGuide": {
         "takeATour": "Take a tour",
         "start": "Start",
-        "next": "Next"
+        "next": "Next",
+	"tours": "Tours"
     },
     "diagnostics": {
         "title": "System Info"

packages/node_modules/@node-red/editor-client/locales/ja/editor.json

@@ -1157,7 +1157,8 @@
     "tourGuide": {
         "takeATour": "ツアーを開始",
         "start": "開始",
-        "next": "次へ"
+        "next": "次へ",
+	"tours": "ツアー"
     },
     "languages": {
         "de": "ドイツ語",

packages/node_modules/@node-red/editor-client/src/js/ui/tab-help.js

@@ -218,7 +218,7 @@ RED.sidebar.help = (function() {
             nodeHelp,
             {
                 id: "tours",
-                label: "Tours",
+                label: RED._("tourGuide.tours"),
                 children: tours
             },
         ];