Modular metadata description on language

I need to change the metadata description of a modular page depending on the language.

Could someone please explain how to do it?

Im new here but I think you can add the language key behind the module name like and need to set the language in the page header.
template: default.EN

So it will search for a `default.EN.html.twig` in your templates folder. 
There is also an other way with twig translation, but I did not understand it yet.

Here in the docs its better explained [Multi-Language](

Thanks for your answer, I’ve tried again, now it works:

Probably looking for more complicate solutions messed up something.