Minor correction in doc/usermanual/po/fr.po
Proof reading a part of chapter 2 of fr.po
Proof reading of a part of chapter 2 of doc/usermanual/po/fr.po (lighttable)
I add the file doc/usermanual/darkroom/modules/color/images/darkroom_module_icon_picker.png that was missing and yielded a warning at compilation time.