[Registration page] The autofill and amount of digits to fill in the phone field doesn't respond to requirements

[Findef]

Environment: Windows 10 Home, Google Chrome 92.0.4515.159.
Reproducible: always.
Build found: 25/08/2021 17:10

Preconditions
A user has already started registration by tapping on the 'Зареєструватися' link on the 'Login' page.

Steps to reproduce

1. Pay attention to the phone field.

Actual result
The autofill is shown as '+38' and the User should enter 10 numeric characters

Expected result
The autofill is shown as '+380' and the User should enter 9 numeric characters

User story and test case links
(#60 Story)"

Labels to be added
"Bug", Priority ("pri: "), Severity ("severity:"), Type ("UI, "Functional"), "API" (for back-end bugs).