i18n: review and augment french translation (approximatively 1/3 done; up to and including about.html)
i18n: review and augment french translation (approximatively 1/3 done; up to and including about.html)

After some hesitations, I decided to keep and settle for "Jalon" as the recommended translation for Milestone, but then the related terminology has to be adapted as well ("Jalon atteint" instead of "Jalon livré").

pkdevbox/trac,pkdevbox/trac,pkdevbox/trac,pkdevbox/trac