Here's a stab at sleeve math for the smallest size:
(Marji: this should help you, though I don't know what size you're doing...)
58 cast on
+12 increased over cotes fantaisie rib
-16 decreased in first row of godron stitch
+ 6 increased in circle portion of godron stitch
- 6 bound off at start of raglan line
+ 5 increased on one side (??) for the button placket
-30 bound off on * to * raglan decreases
-12 bound off on every other row raglan decreases
- 3 bound off on right side at "A"
- 8 bound off on left side
- 6 bound off on left side
Looks good to me... anyone else?
As for the pattern translations, I'm pretty sure because the pattern says "tous les 6 rangs et tous les 8 rangs" (tous=every or all) it means every sixth row you increase 1 and every 8th row you increase 1. But then you'd run into problems with row 24 - which is divisible by both 6 and 8. But I'm not sure - perhaps we should ask the french knitalong folks? Can anyone shed some light on this?
I just finished the ribbing portion for my sleeves and admittedly kind of fudged the increasing until I had enough stitches (in fact I left out one round of increases just because my gauge is a little larger). Fudging is not the answer for everyone, but it worked well for me.