Translate all header values

Author: tessig

src/app/code/community/FireGento/GridControl/Model/Processor.php

@@ -130,7 +130,11 @@ protected function _addAction($params)
                 $columnConfig[$attribute->getName()] = (string) $attribute;
             }
         }
-
+        
+        if (isset($columnConfig['header'])) {
+            $columnConfig['header'] = $params->getBlock()->__($columnConfig['header']);
+        }
+        
         // add column to grid block
         $params->getBlock()->addColumn($params->getColumn()->getName(), $columnConfig);
     }
@@ -220,4 +224,4 @@ protected function removeGridColumn(Mage_Adminhtml_Block_Widget_Grid $grid, $col
         $this->setGridProtectedPropertyValue($grid, $columnsPropertyName, $columns);
         $this->setGridProtectedPropertyValue($grid, $lastColumnIdPropertyName, $lastColumnId);
     }
-}
+}