Move code from contextual filter to custom function

In some views we have following code in contextual filters that checks for related content, we need to move it into separate function and make be rewrite to take into account multilingual terms.

  $node = node_load(arg(1));
  $terms = array();
  if($node && !empty($node->field_tags[LANGUAGE_NONE])) {
    foreach($node->field_tags[LANGUAGE_NONE] as $term) { $terms[] = $term['tid']; }
  }
  return implode('+',$terms);

This is issue is both related to OpenAcaDept Feature and Core modules.