Error on login when user has non-latin character in username or password

[DenysVuika]

Posted originally here
Possible solution: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range.

Type of issue: (check with "[x]")

- [ ] New feature request
- [x] Bug  
- [ ] Support request

Current behaviour:
Error occurs and login fails.

Expected behaviour:
Login is successful without errors.

Steps to reproduce the issue:
Pre-conditions:

1. Go to Alfresco Content Services (Platform or Share) and create any valid user that contains in its username and password non-Latin characters (e.g. Russian, Chinese, French, Romain characters ,etc)
2. In a browser enter: http://:/login
3. Enter the user's details created in preconditions and press SIGN IN button.

Component name and version:
ng2-alfresco-login

Browser and version:
Chrome

Node version (for build issues):

New feature request: