New VBO bulk operation button not get translated
Sharing a link below:-

http://www.drupalcontrib.org/api/drupal/contributions!views_bulk_operations!views_bulk_operations.api.php/function/hook_views_bulk_operations_form_alter/7

Here a function 
function hook_views_bulk_operations_form_alter(&amp;$form, &amp;$form_state, $vbo) {
} 
We can use this function and here we can actually do custom code for this particular action and set the label accordingly.

Would be able to answer more appropriately if you share some more details with your question that what you basically did.