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PAL 4:3 and 16:9 video on a DVD-Video disc are both 720x576; the difference is the the pixel aspect ratio or "PAR". PAL 4:3 has a 1.067 PAR and 16:9 has a 1.422 PAR.

To get your widescreen movies into Encore and on DVD, you would have to export them from the application you edited with as 720x576 with the PAR setting for 16:9.

"PAR" is pixel aspect ratio. I'm afraid I don't know how that translates into French. On your computer monitor every pixel is square; the width is the same as the height, which means that it is a pixel aspect ratio of 1. Many types of video uses pixels that are not square, but rectangular. E.g. NTSC 4:3 DV and MPEG-2 for DVD (720x480) has pixels that are "portrait" (taller than they are wide) and have a PAR of 0.9. PAL uses 720x576 to create the same 4:3 image and its pixels are "landscape" (wider than they are tall) with a PAR of 1.067.

It may help to check these documents:
Square and Non-Square Pixels
Work with non-square pixels

Which application are you using for editing?

1.422 :)