$form['#prefix']='<p>'.$this->t('These settings apply to the %field field everywhere it is used. Some also impact the way that data is stored and cannot be changed once data has been created.',['%field'=>$field_label]).'</p>';
$form['#prefix']='<p>'.$this->t('These settings apply to this field everywhere it is used. Some also impact the way that data is stored and cannot be changed once data has been created.').'</p>';
// Add settings provided by the field module. The field module is
// Add settings provided by the field module. The field module is
// responsible for not returning settings that cannot be changed if
// responsible for not returning settings that cannot be changed if