Should be taken care of via https://gerrit.wikimedia.org/r/335249

For QA:

• Go to create an account, and type in a sufficiently unique username (e.g. a bunch of random letters, like "kjasdhkjaherqsdfs")
• For the password, enter "qwerty", and the same for the password confirmation.
• Tap the "Next" button to create the account (you may also need to enter a CAPTCHA).
• The app should show an error to the effect of "Commonly used passwords cannot be used", and should NOT successfully create the account.

This is still broken. I've gotten not just the "Commonly used passwords cannot be used" error, but repeat attempts to create an account gave me CAPTCHA errors until my IP reached it's limit for account creating for the day