Merge similar but not quite identical translated strings.

Some translated strings appeared several times in almost but not quite
identical form. Remove a few of them so that they don't have to be translated
multiple times.

Closes #13637.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@69828 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/html/helpwnd.cpp

@@ -1557,7 +1557,7 @@ void wxHtmlHelpWindow::OnToolbar(wxCommandEvent& event)
 #if wxUSE_LIBMSPACK
                     _("Compressed HTML Help file (*.chm)|*.chm|") +
 #endif
-                    _("All files (*.*)|*");
+                    wxALL_FILES;
                 wxString s = wxFileSelector(_("Open HTML document"),
                                             wxEmptyString,
                                             wxEmptyString,