Bonjour;
Decimal Point and thousand Separator (for French Language).
Edit you language (Editez votre Langue) French/Français as in the following picture:
If necessary do the same for the English Language (Si necessaire, effectuer les mêmes modifications pour la langue Anglaise), cause it seems that some reports ignores the user languages and use the default language.
You can also modify your res_lang.py (../opener/addons/base/res/res_lang.py)file (Vous pouvez ausssi modifier votre fichier res_lang.py) as follow:
Comment 5 lines from line 214 to 218.
formatted = decimal_point.join(parts)
# while seps:
# sp = formatted.find(' ')
# if sp == -1: break
# formatted = formatted[:sp] + formatted[sp+1:]
# seps -= 1
elif percent[-1] in 'diu':
if grouping:
Remember, that for the last solution , you will loose your change after each update !!!