[Inkscape-translator] Plurals for 0.92

I'm trying to push the Polish translation for 0.92 and I have noticed a few places where plurals would make sense.

This is one such example in export.cpp

prog_dlg = create_progress_dialog(Glib::ustring::compose(_("Exporting %1 files"), num)); prog_dlg->set_data("exportPanel", this); setExporting(true, Glib::ustring::compose(_("Exporting %1 files"), num));

I could change the code and push it into the branch but I wonder if it's a little late. Should I fix it in master instead or leave it out as a minor thing?

Thanks, Marcin