Fix gettext warning "Empty msgid"
Empty string tag should not be marked as 'translate'.
TrivialFix
<th st-sort="ctrl.sortByField[4]">
{$ ctrl.tableHeadCells[4].text $}
</th>
- <th class="action" translate></th>
+ <th class="action"></th>
</tr>
</thead>
<tbody>
