The entire system, including the menus supports Unicode characters (all foreign characters).
Option 1
The best customer experience is delivered by simply loading menus in the languages you wish to display.
The customer can the choose the language they prefer by selecting the corresponding language menu. (as shown in the animated GIF below)

Option 2
You can display both languages on each menu item.
We have found that these are the bests way to deliver a self-service menu experience in multiple languages.

We trust that this meets your requirement? If not, please let us know the details.