Tidy up markdown toolbar handling across all editors

Any editor for the markdown mode will now automatically get
the markdown toolbar added.

The comment node has been updated to handle this properly and
to not add two copies of its content to the sidebar.

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

@@ -22,8 +22,7 @@
         "status": "状态",
         "enabled": "有效",
         "disabled": "无效",
-        "info": "详细描述",
-        "tip": "详细描述支持Markdown轻量级标记语言，并将出现在信息标签中。"
+        "info": "详细描述"
     },
     "menu": {
         "label": {
@@ -191,7 +190,6 @@
         "output": "输出:",
         "deleteSubflow": "删除子流程",
         "info": "详细描述",
-        "format": "标记格式",
         "errors": {
             "noNodesSelected": "<strong>无法创建子流程</strong>: 未选择节点",
             "multipleInputsToSelection": "<strong>无法创建子流程</strong>: 多个输入到了选择"