Expression error with Dropdown Menü

Hey 🙂

my expressions in the Dropdown menu is writtin with an "ü" sign. 
I created a mogrt using all Dropdown menus with an "ü" on a windows machine. 
But when the customer opens it on a mac machine it has a comma instead of the "ü" sign.

Can someone explain this to me? He told me also its not possible to change the comma.


Best greetings Mischel