1.twig

{% block checkbox_radio_label %}
    {# Do not display the label if widget is not defined in order to prevent double label rendering #}
    {% if widget is defined %}
        {% if required %}
            {% set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' required')|trim}) %}
        {% endif %}
        {% if parent_label_class is defined %}
            {% set label_attr = label_attr|merge({class: (label_attr.class|default('') ~ ' ' ~ parent_label_class)|trim}) %}
        {% endif %}
        {% if label is not sameas(false) and label is empty %}
            {% set label = name|humanize %}
        {% endif %}
        <label{% for attrname, attrvalue in label_attr %} {{ attrname }}="{{ attrvalue }}"{% endfor %}>
            {{- widget|raw -}}
            {{- label is not sameas(false) ? label|trans({}, translation_domain) -}}
        </label>
    {% endif %}
{% endblock checkbox_radio_label %}