inline_entity_form widget tweaks

gistfile1.php

<?php

/**
 * Implements hook_field_widget_WIDGET_TYPE_form_alter().
 *
 * Make some visual tweaks to the inline entity form and it's subforms.
 */
function custom_field_widget_inline_entity_form_form_alter(&$element, &$form_state, $context) {
  $info = entity_get_info($element['entities']['#entity_type']);

  // If there is ony one bundle available to use, change the wording in the
  // buttons to be more helpful and reference that bundle only, rather than
  // the entity type.
  if (!empty($element['actions']['bundle']['#value']) && $element['actions']['bundle']['#type'] == 'value') {
    $bundle = drupal_strtolower($info['bundles'][$element['actions']['bundle']['#value']]['label']);
    $bundle_lowercase = drupal_strtolower($bundle);
    if (isset($element['actions']['ief_add']['#value'])) {
      $element['actions']['ief_add']['#value'] = t('Add @bundle', array('@bundle' => $bundle_lowercase));
    }
    if (isset($element['actions']['ief_add_existing']['#value'])) {
      $element['actions']['ief_add_existing']['#value'] = t('Use existing @bundle', array('@bundle' => $bundle_lowercase));
    }
  }

  $state = $form_state['inline_entity_form'][$element['#ief_id']];

  if (!empty($element['form'])) {
    $bundle = $info['bundles'][$state['form settings']['bundle']]['label'];
    $bundle_lowercase = drupal_strtolower($bundle);
    if ($state['form'] == 'add') {
      $element['form']['#title'] = t('Add @bundle', array('@bundle' => $bundle_lowercase));
      $element['form']['actions']['ief_add_save']['#value'] = t('Save @bundle', array('@bundle' => $bundle_lowercase));
    }
    elseif ($state['form'] == 'ief_add_existing') {
      $element['form']['#title'] = t('Select an existing @bundle', array('@bundle' => $bundle_lowercase));
      $element['form']['entity_id']['#title'] = check_plain($bundle);
      $element['form']['actions']['ief_reference_save']['#value'] = t('Select @bundle', array('@bundle' => $bundle_lowercase));
    }
    elseif ($element['form']['#op'] == 'clone') {
      $element['form']['#title'] = t('Clone @bundle', array('@bundle' => $bundle_lowercase));
      $element['form']['actions']['ief_clone_save']['#value'] = t('Save @bundle', array('@bundle' => $bundle_lowercase));
    }

    if (!empty($element['form']['#title'])) {
      $element['form']['ief_form_title'] = array(
        '#markup' => '<h4>' . $element['form']['#title'] . '</h4>',
        '#weight' => -100,
      );
      unset($element['form']['#title']);
    }
  }

  if (!empty($state['entities'])) {
    foreach ($state['entities'] as $delta => $entity_state) {
      if ($entity_state['form'] == 'edit') {
        $bundle = $info['bundles'][$element['entities'][$delta]['form']['#bundle']]['label'];
        $bundle_lowercase = drupal_strtolower($bundle);
        $element['entities'][$delta]['form']['actions']['ief_edit_save']['#value'] = t('Save @bundle', array('@bundle' => $bundle_lowercase));
      }
    }
  }

  // Force the parent element to always be rendered as a fieldset so that we
  // never lose the parent field title, description, and required indicators.
  $element['#type'] = 'fieldset';

  // Add support for the field help text.
  if (!empty($context['instance']['description'])) {
    $element['#description'] = field_filter_xss($context['instance']['description']);
  }
  else {
    $element['#description'] = '';
  }

  // Only re-add the cardinality description if you can add more than one
  // value, and this isn't an unlimited-value field.
  if ($context['field']['cardinality'] != FIELD_CARDINALITY_UNLIMITED && $context['field']['cardinality'] > 1) {
    if (!empty($element['#description'])) {
      $element['#description'] .= ' ';
    }
    $element['#description'] = t('You have added @entities_count out of @cardinality_count allowed.', array(
      '@entities_count' => count($state['entities']),
      '@cardinality_count' => $context['field']['cardinality'],
    ));
  }

  // Add the required marker to the title.
  if ($context['instance']['required']) {
    $element['#title'] .= theme('form_required_marker');
  }
}