Hi all
It's maybe too late for Cedric but I had the same problem as he had (zimbra 5.0.10) and it could be usefull to others.
Be sure to have "make" installed on your system (apt-get install make) before you apply the french patch, or the french dictionary won't be installed (and that without any warning).
If you don't do that and you try to use the spellchecker you get this message:
Une erreur réseau s'est produite. msg: system failure: Spell check failed: Unable to open Aspell dictionary for locale fr_FR
code: service.FAILURE
method: CheckSpellingRequest
detail: soap:Receiver
trace: btpool0-10:1217669037291:a0f3783162bd148a
It was as simple as that for me.
Good luck
