This is a setup for multi language menu(and maybe simple dialogues) for unity, reading XML files. It was made on Unity 2017.4.17f1 LTS. It may be working in more recent versions, you can try it.

unity のinspectorが同じメニューしか出てこない、ほかのメニューが表示されない、そんなときは、右上の鍵マークがオンになっているかもしれない。ロックを外せば、他のも表示される。

‘How can I disable the App Menu in Unity?‘ is a question often asked by a handful of users unable to adjust to the menus of applications being embedded in Unity’s top panel. But a solution to this ...

In Unity scene, show context menu when mouse right button click on the target gameobject and click the menu item to do something. IContextMenuElement : Interface for context menu element.