Not sure about this one since the menu is neither translatable nor look like other Geany's menus. Maybe manually implementing a basic menu would be better?
Should a bug/feature request also be reported to Scintilla?
Its not really Scintilla's problem that Geany menus look different :-)
And Scintilla/Scite has its own translation system which we havn't integrated, see http://code.google.com/p/scite-files/wiki/Translations
Cheers Lex