How do you add a context menu without knowing the display language

I want to add a contextual menu in InDesign. I use this command:
app.menus.item("Text Context Menu").submenus.item("MY_MENU")

It works, but when I switch my local to another than english (ex.: fr_FR) , it won’t add because I have to use this:
app.menus.item("Menu contextuel Texte").submenus.item("MY_MENU")

I’ve tried with ‘index’ attribut, but it changes depending on the language.

How can I add menu items without knowing the name which is language dependent.