EN suggestions, FR additions.

English suggestions are based on my opinion on how more common the term "Windage" is speaking about scopes.
http://en.wikipedia.org/wiki/File:Schmidt_%26_Bender_5-25x56_PM_II_LP_controls.jpg

As for French, this is based on my army time and on books by Philippe Perotti "De 1 à 1000: Techniques de tir au fusil à lunette, instruction tactique et emploi des tireurs d'élite", "Tireur d'élite : Sélection des personnels, formation technique, programme de tir".
Merge pull request #1119 from 11RDP-LoupVert/patch-39

EN suggestions, FR additions.