[#83] Ability to edit user

[DenisZackharov]

Summary

A brief description of the pull request.

How it works

Test plan

List of steps to manually test introduced functionality:

1. Run server with bin/dev (or bin/rails s)
2. Login with credentials: email, password
3. click on your account name
4. Try to edit field
5. write current password, and click update button

Checklist:

• [x] I have performed a self-review of my own code
• [x] I have added tests for new functionality
• [ ] My pull request is shorter than 300 lines

Deploy notes

Notes regarding deployment the contained body of work. These should note any db migrations, ENV variables, services, scripts, etc.

[RasimKhusaenov]

Duplicating error message:

Email can't be blank and Email can't be blank