Improve UX on Signup Page

We've made minor changes to our signup process to no longer automatically remove excess characters from passwords that are longer than the maximum 15 characters that we support.

Instead of automatically removing any extra characters and letting the user proceed, we now allow the input of more characters and show the user a proper error message instead.

This prevents users from assuming that their extra long password got saved, just to then get stuck on the login page.

The same change was also applied to the "Reset Password" page within the "Forgot Password" flow.