Edit language drop down

Dear all,
I have a survey in both Dutch und French and it also contains an English translation which allows us to work with the data.
However, the respondents are only meant to select between Dutch and French in the language dropdown menu. How can I disable English in the language dropdown menu the respondents see within a survey without actually deleting the English translation?
Thanks for your support!

P.S.: apologies if this question has been asked before - I wasn't able to source an answer here.