TD: Issue #0004473: Expose openCommand() to translation

Continuing the work to expose the undo/redo functionality to translation. This commit does so for the TechDraw Wb.  
Ticket: https://tracker.freecadweb.org/view.php?id=4473

src/Mod/TechDraw/Gui/TaskCosmeticLine.cpp

@@ -269,7 +269,7 @@ bool TaskCosmeticLine::accept()
         m_partFeat->requestPaint();
     } else {
         //update mode
-        Gui::Command::openCommand("Update CosmeticLine");
+        Gui::Command::openCommand(QT_TRANSLATE_NOOP("Command", "Update CosmeticLine"));
         updateCosmeticLine();
         m_partFeat->refreshCEGeoms();
         m_partFeat->requestPaint();