You make audio captcha, deaf people complain. If you come back to the good old 6 letters, blind one gonna whine. The numbers are in english, spanish guys cry. If you listen to them and make numbers spanish, arabic ones gonna yell. Enough now, come on...

the faucet is in English it is normal for the audio to be in English!
and learning from 0 to 9, in another language is not so difficult. Just write the numbers with the sound of them in an paper.