Edit: you need to of course also take into account the default case, if the id parameter is omitted, i.e., e.g.:
´$id = isset( $instance['id'] ) ? $instance['id'] : 'lang_choice';`
Edit: you need to of course also take into account the default case, if the id parameter is omitted, i.e., e.g.:
´$id = isset( $instance['id'] ) ? $instance['id'] : 'lang_choice';`