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   2. drupal7

Menu access callback.

Only display translation tab for node types, which have translation enabled and where the current node is not language neutral (which should span all languages).

Code

modules/translation/translation.module, line 78

<?php
function _translation_tab_access($node) {
  return !empty($node->language) && translation_supported_type($node->type) && node_access('view', $node) && user_access('translate content');
}
?>