A bit silent, not many PP users I guess, must admit I tend to use just the default settings so never bothered messing around much with the rest. Anyway - I don't know about previous versions of PP, but for PP2003 you can use different language packs as set in Start/Programs/MicrosoftOffice/Office Tools/Language settings. This will apply to all Office programs.
Not too sure what you mean by Dia, so can't help there.
Size of 'paper' is set the same way as other Office programs - File/Page setup - measured in cm
Hope this is what you mean.
Regards