Add title on logo link

[airbundle] / Resources / views / form / _login.html.twig

{{ form_start(login) }}

        <section>
                {{ form_row(login.mail) }}

                {{ form_row(login.password) }}
        </section>

        {{ form_row(login.submit) }}

        {# Render CSRF token etc .#}
        <footer style="display:none">
                {{ form_rest(login) }}
        </footer>

{{ form_end(login) }}