Alert on updating language in wrong (old) language

[SpyCop]

On updating the user settings and changing the language the alert shown for updating the settings is loaded from the wrong (the not-updated) language file.

[SpyCop]

Proposed solution:
Session::set_flash('success', __('user.alert.success.update'), $user->lang);

HTweb/fuel/app/classes/controller/users/admin.php

Line 97 in 3f9d24f

Session::set_flash('success', __('user.alert.success.update'));