MAJOR UPDATE

SAppLanguage and sbMenuStrings classes COMPLETED insofar as building
Songbird's menu bar is concerned. All that is required is additional
<menu> elements in the language file and a corresponding function ID for
the EVT_MENU macros wxWidgets needs in SAppFrame.h/.cpp

Moving on to beginning of writing default xml language config and design
more settings for Songbird to cover all start-up configuration possible.