Grammalecte - libreoffice


Can someone give me a clue to install the grammalecte extension on libreoffice ?

CLD installed yesterday with a -current ISO and updated.
Libreoffice is the binary installed by default.
Grammalecte is a tool to check errors like grammar, typo, … etc.

Here is the grammalecte error logs :

<type 'exceptions.SyntaxError'>: Non-ASCII character '\xe2' in file /home/fred/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu280859rai2k.tmp_/Grammalecte-fr-v0.5.15.oxt/pythonpath/grammalecte/fr/ on line 32, but no encoding declared; see for details (, line 32), traceback follows
  /usr/lib64/libreoffice/program/ in function _uno_import() [return _g_delegatee( name, *optargs, **kwargs )]
  /home/fred/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu280859rai2k.tmp_/Grammalecte-fr-v0.5.15.oxt/pythonpath/grammalecte/fr/ in function <module>() [from .gc_engine import *]
  /usr/lib64/libreoffice/program/ in function _uno_import() [return _g_delegatee( name, *optargs, **kwargs )]
  /home/fred/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu280859rai2k.tmp_/Grammalecte-fr-v0.5.15.oxt/ in function <module>() [import as gce]
  /usr/lib64/libreoffice/program/ in function getModuleFromUrl() [exec(codeobject, mod.__dict__)]
  /usr/lib64/libreoffice/program/ in function writeRegistryInfo() [mod = self.getModuleFromUrl( locationUrl )]