translate column names in "sort by" and "group by" option lists

Author: Alexander Smishlajev

templates/classic/html/issue.index.html

@@ -102,7 +102,8 @@
      <option tal:repeat="col context/properties"
              tal:attributes="value col/_name;
                              selected python:col._name == request.sort[1]"
-             tal:content="col/_name">column</option>
+             tal:content="col/_name"
+             i18n:translate="">column</option>
     </select>
    </td>
    <th i18n:translate="">Descending:</th>
@@ -118,7 +119,8 @@
      <option tal:repeat="col context/properties"
              tal:attributes="value col/_name;
                              selected python:col._name == request.group[1]"
-             tal:content="col/_name">column</option>
+             tal:content="col/_name"
+             i18n:translate="">column</option>
     </select>
    </td>
    <th i18n:translate="">Descending:</th>