I get wrong numbers all the time in other languages. I only speak English fluently. The languages I studied previously were mainly in writing so speaking other languages is quite intimidating for me.
Top languages in my area: Spanish (mainly Mexico and Puerto Rico), Vietnamese, Korean, and Russian. I’ve also encountered Igbo, Yoruba, Arabic, and Haitian Creole.
Learning how to say something like “I only speak English” would be helpful as well.
I did find this website but I have no way of knowing how accurate it is:
I’d return a non-zero value so they know it’s their fault ^^