Issue #3064455 by hiramanpatil, jcnventura: t() calls should be avoided in classes

              $options[$field_name] = $field_label;

            }

            $form[$entity][$bundle_name]['fields'] = [

              '#title' => t('Fields'),

              '#title' => $this->t('Fields'),

              '#type' => 'checkboxes',

              '#description' => t('Select fields you would like to log on update'),

              '#description' => $this->t('Select fields you would like to log on update'),

              '#options' => $options,

              '#default_value' => isset($config[$bundle_name]['fields']) ? $config[$bundle_name]['fields'] : [],

            ];