[Registration] Change the password hint message and validation

[MissMS]

Problem: A hint message on the Password field contains the confusing value of the field length (50 symbols max) because it doesn't match the actual validation of that length (20 symbols max). Also, there were no requirements for the actual field length in the initial user story, so it is only limited by the DB.

Acceptance criteria:

1. Update the hint message on both Password fields:
   • Повинен містити від 8 символів, A-Z, a-z, 0-9
2. Max number of symbols on email must be 128
   • change the validation on the fields per the doc - Field#3 [BR-CPF-13 + validation#6]

Epic: #3
Affects: #1