Function password_change_render 

pub async fn password_change_render(
    db: &Db,
    registry: &AdminRegistry,
    legacy_entries: &[AdminEntry],
    identity: Option<&Identity>,
    csrf_token: Option<&str>,
    error: Option<&str>,
) -> String

Render admin/password_change.html. error shows as an alert banner on top when the previous submit failed.