[Cin] French translation update

[Phyllis Smith]

Olivier, concerning the following:

Note that to do this (attached) translation, I did those steps:
>
> 1. extracted the tarball
> 2. edited po/xlat.sh and added "--from-code utf-8" to the xgettext line
> (see [1] below)
> 3. ran: po/xlat.sh > po/cin.po (my understanding is that this command
> updated the general "cin.po" catalog)
> 4. ran: msgmerge -U po/fr.po po/cin.po (my understanding is that this
> command updated the French "fr.po" translation file from the general
> "cin.po" catalog)
> 5. translates the po/fr.po
>
> It would be great if the knowledgeable people (ping the usual suspects
> here: Phyllis & GG!) could tell me if this workflow is fine.
>
> The workflow is fine! We were unaware of "msgmerge" but now that I know, I
will add this to the documentation because it might be a lot easier to
follow.  Thanks, GG/Phyllis
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