templates/admin/category/_form.html.twig
{{ form_start(form) }}
<div class="row">
<div class="col-md-6 col-xs-12" style="padding: 0">
{{ form_row(form.name) }}
</div>
<div class="col-md-6 col-xs-12">
<button class="btn btn-primary addCateg">
{{ button_label|default('Créer une nouvelle catégorie') }}
</button>
</div>
</div>
{{ form_end(form) }}