Absolutely love the work done here! Only change I would make is change "rubber" to "eraser" to help more English speaking children understand the content (:
I've just changed it to 'eraser' but actually I should make it conditional on your navigator.language...
Is maths in British English plural? Like, should that be “the maths say”?
I have an even weirder example from Russian language: file, folder and pocket are 3 out of dozen different words being used to describe a plastic envelope for documents in various regions and people don't understand each other. I remember only one more.