[BUG]My account - Email change is not working

[akrajna]

Describe the bug
In my account the option Email change is not working.

How to reproduce
Initial condition: user is logedin

1. Go to 'My account'
2. Click on 'Email change'
3. Fill in the fields: 'Your new e-mail', 'Confirm e-mail', 'Your password'
4. Click on 'UPDATE EMAIL'
5. See error
   -->

Expected behavior
User is able to change his email address in My account

Actual behavior
User is not able to change his email address in My account

Screenshots

Devices (please complete the following information):
All devices

[Michal-Dziedzinski]

related to #555 and will be closed there as well

[patzick]

done, @akrajna please reopen if the problem still occurs

[akrajna]

The bug still exists. It is impossible to change email in My account.

[akrajna]

It works correctly