J'ai trouvé la fonction, module ps_emailsubscription.php, mais pas le bug si qqun a une piste
public function hookAdditionalCustomerFormFields($params) { $label = $this->trans( 'Sign up for our newsletter[1][2]%conditions%[/2]', [ '_raw' => true, '[1]' => '<br>', '[2]' => '<em>', '%conditions%' => Tools::htmlentitiesUTF8( Configuration::get('NW_CONDITIONS', $this->context->language->id) ), '[/2]' => '</em>', ], 'Modules.Emailsubscription.Shop' ); return [ (new FormField())->setName('newsletter')->setType('checkbox')->setLabel($label), ];