- about.dfm: the layout of the "About" dialog box is slightly different

 - about.dfm: the layout of the "About" dialog box is slightly different
 - misc.cpp: toolbar buttons are translated too
 - mainframe.dfm: removed the "Back" and "Eject" toolbar buttons, which
   were rather useless, and added an "Eject disc" menu entry
   Also hid the caption for all the toolbar buttons
 - win32.cpp: Added a config option to display or not these captions
 - preferences.cpp: small modification to support non-advanced mode