Merge branch '100-hide-strength-meter' into 'master'

Hide password strength meter when confirming password

Closes #100

I opted to hide the strength meter because:

* more extensive changes would have been required to set the strength meter to 100% red.
* IMHO it would lead to confusion as to the meaning of the strength meter.
* the "passwords do not match" error should eventually become a proper error of the confirm EditText, not a separate label.

See merge request !2