If, under computer voices in Home, there is no French voice offered either when the selection for the voices is 'default' or when the selection is set to 'all', then I'm afraid you are out of luck.
I think you are looking in the wrong place. I'm offered 2 French voices for my 720, 1 male and 1 female so the 730's should have them, too.
Add Maps/Voices. Now, arrow right 2 screens to Computer Voices. Click that icon and, afrer the loading bar is finished, you should see the voices offered.
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