Unable to translate field label and description containing html tags/entities.

Problem/Motivation

If field label contain any html entities or field description contain any html tags then i18n_field is unable to translate both label and description.
This problem exists because when core creates $element array in field_default_form or field_multiple_value_form

      $element = array(
        '#entity' => $entity,
        '#entity_type' => $instance['entity_type'],
        '#bundle' => $instance['bundle'],
        '#field_name' => $field_name,
        '#language' => $langcode,
        '#field_parents' => $parents,
        '#columns' => array_keys($field['columns']),
        '#title' => check_plain($instance['label']),
        '#description' => field_filter_xss($instance['description']),
        // Only the first widget should be required.
        '#required' => $delta == 0 && $instance['required'],
        '#delta' => $delta,
      );

And in i18n_field_field_widget_form_alter while replacing label and description translation

  if (!empty($instance_current['label']) && $instance_current['label'] != $instance['label']) {
    if (!empty($element['#title']) && $element['#title'] == $instance['label']) {
      $element['#title'] = $instance_current['label'];
    }
    if (isset($element['value']) && !empty($element['value']['#title']) && $element['value']['#title'] == check_plain($instance['label'])) {
      $element['value']['#title'] = $instance_current['label'];
    }
  }
  .
  .
  .
  if (!empty($instance_current['description']) && $instance_current['description'] != $instance['description']) {
    if (!empty($element['#description']) && $element['#description'] == $instance['description']) {
      $element['#description'] = $instance_current['description'];
    }
    if (isset($element['value']) && !empty($element['value']['#description']) && $element['value']['#description'] == field_filter_xss($instance['description'])) {
      $element['value']['#description'] = $instance_current['description'];
    }
  }

Proposed resolution

As seen in core code while creating $element['#title']$instance['label'] is passed through check_plain

$element['#title'] = check_plain($instance['label']);

And for $element['#description']$instance['description'] is passed through field_filter_xss.

$element['#description'] = field_filter_xss($instance['description']);

i18n_field_field_widget_form_alter should do the same.

Remaining tasks

• Create a patch.
• Verify changes.
• Review the patch
• Get the patch committed

User interface changes

none

API changes

none

Related Issues

#1157512: Labels are not translated with i18n_field for Drupal core.