YOu can keep it installed, they will be installed on the very same place. Inside the app package are additionally plugins installed. Although the program will launch in the language of the OS, but these plugins will be active in any localization when they have been installed.
It will beginn with a different new document, binding (Bindung here in German) is added:

The story can go in different directions:

Paragraphs have more options, like direction:

And even a character string can change its direction:

And as you see, even if I have a German Loc installed, some additional menus are still in English.
But there are a lot more menus, additional options in all styles, tables have also some linguistig and directional menus, and you will find a lot more.