Improve the text of the task: M121 -> Ch1 -> Homework1

I think better use the text 'contains EXACTLY “English” and “Japanese”'
Because the current version is confusing and reads as ‘may contain “English” and “Japanese”’ (at least for me)

Hi @biryukvy,

Thanks for your feedback. We will look into it and make the necessary changes.

~ Shubham