Rather than ask if English is the home language of the respondent, ask for the home language. A list of 15 or so with an Other fill-in would capture all home languages, providing more information while still providing the information of the original question.
I agree the formulation of the question is not ideal -- but as an educational charity, the OER Foundation tries to keep our resource costs to a minimum by automating the data collection rather than imposing post-survey processing time. I'm not aware of any of the free survey engine services that would be able to pre-populate language options so we could automate the data-processing, I could be wrong.
What 15 languages do you suggest we should include in the list and what are the moral issues associated with excluding a language from the list. I figured with the English listed question -- this could be justified on the grounds as the dominant medium of "instruction" - -certainly not the dominant medium of learning!