Hi,
if you want to localize the headers of the tabs you can modify the Tab.grid.template in this way:
<li><a href="#TabGridCell_[%= cell.hashCode() %]"><bean:message key="[%=label%]"/></a></li>
In fact you can use the bean:message tag and set the translations in the Localization Window. In this case the key is the value of the 'label' parameter.