Update French onepage translation

[tbertels]

In the fourth panel of the onepage French translation, "ses" should be in italic.

Incidentally, a space could be added before "!" in the sixth and eighth panels to respect French typographic rules.
@MeixDev do you still have the source PNG file (in GIMP or Photoshop format)?

[MeixDev]

Heh.. I'm really sorry, I don't have the source files anymore, don't even remember the fonts and sizes used. It was a messy project honestly.

[tbertels]

No problem, I've found out the font is Patrick Hand and the size is 93.
I made most changes except for the italic "ses" by copy and paste:

• "ses" -> italic
• space before the "!"
• added missing "de" in second to last panel
• lowered the "'" (apostrophe) in the fifth panel

The result is below, can someone update https://github.com/DP-3T/documents/blob/master/public_engagement/cartoon/fr/onepage.png?