Simple Admin Language Change < 2.0.2 - Arbitrary User Locale Change

Description

The plugin did not have proper capability and CSRF checks in its change_user_locale AJAX action, and was also affected by an IDOR issue, allowing any authenticated user to change the locale of another user.

v2.0.1 fixed the authorisation and IDOR but still had an incorrect CSRF logic which was fixed in 2.0.2