Add password messages

[AleksaMCode]

Adds additional messages when dealing with passwords to enhance the UX.

Description

When entering long passwords, users were confronted with a message "Must have capital, small, number & special chars." This would cause confusion with users as the password contained all the needed characters. The long password were rejected because the Regex expression requires passwords to be of a certain length, between 8 and 15 characters in length exactly. However, the end user doesn't know that there are password length limitations and is left to wonder why the password isn't accepted.

With these changes, when registering or changing their password, users will be meet with messages "Password is too short" or "Password is too long" when the password isn't of the appropriate length.

Related Issue

Closes #1170

Motivation and Context

Reviewers

How Has This Been Tested?

Tested manually

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other

Checklist:

• My code follows the code style (modified PEP8) of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[viyatb]

@AleksaMCode this will also need a check on the backend side - simply frontend check won't work unless
https://github.com/owtf/owtf/blob/develop/owtf/models/user.py#L19C1-L20C1 is changed.