Ep29 [fr] complete nitpick

Includes fixes for spelling & typography as usual.

Additionally, some English onomatopoeia are replaced by the French equivalent:

• Ewww! → Pouah !
• Fizzz! → Zwiff !
• BOOM → BOUM

Of course those will be in the English version.

The diff should be mostly easy to review, I didn't include irrelevant clutter generated by inkscape.