I can not change the nationality (country/region) of my account .... can anyone help me? thanks
For Both Windows and Mac the Language that ADE displays in is based upon the language used by the Operating System. For Windows there's not much that can be done to change this. For Mac you can restrict the languages used by doing a "Get Info..." on the Application in the finder - looking at the languages sections, and unchecking those that you don't want to be displayed.
Europe, Middle East and Africa