Just create a group and only assign it edit rights recursive from the startpage?

I have created a language version of an existing site. Now i want user to change the content of newly creted language version.

To set these rights, i want them to restrict just to their language version, so that they dont mess up withthe main website version.

Let me know if i didnt make myself clear.

Basically i dont want them to choose the different language when they are in edit mode form left pane at the bottom drop down menu.