Delete entity translation leftovers (field values in languages other than the node language that are not LANGUAGE_NONE).

cleanup_field_values.php

<?php
function EXAMPLE_cleanup_field_values($node_type = null) {
  $query = new EntityFieldQuery;
  $query->entityCondition('entity_type', 'node');
  if($node_type) {
    $query->entityCondition('bundle', $node_type);
  }
  $results = $query->execute();
  if(empty($results['node'])) {
    return;
  }
  foreach($results['node'] as $node) {
    $node = node_load($node->nid);
    $node_lang = $node->language;
    $updated = false;
    foreach(array_keys(field_info_instances('node', $node->type)) as $field_name) {
      if(empty($node->$field_name)) {
        continue;
      }
      foreach(array_keys($node->$field_name) as $field_lang) {
        if($field_lang !== $node_lang && $field_lang !== LANGUAGE_NONE) {
          $node->{$field_name}[$field_lang] = array();
          $updated = true;
        }
      }
    }
    if($updated) {
      node_save($node);
    }
  }
}