Image: Issue #4473: Expose openCommand() to translation

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

src/Mod/Image/Gui/Command.cpp

@@ -152,7 +152,7 @@ void CmdCreateImagePlane::activated(int iMsg)
 
         QString pyfile = Base::Tools::escapeEncodeFilename(s);
 
-        openCommand("Create ImagePlane");
+        openCommand(QT_TRANSLATE_NOOP("Command", "Create ImagePlane"));
         doCommand(Doc,"App.activeDocument().addObject('Image::ImagePlane','%s\')",FeatName.c_str());
         doCommand(Doc,"App.activeDocument().%s.ImageFile = '%s'",FeatName.c_str(),(const char*)pyfile.toUtf8());
         doCommand(Doc,"App.activeDocument().%s.XSize = %d",FeatName.c_str(),nWidth);