[RC3] Error when load/reload official translation

In RC3 when load or reload the official translation i have an errors messages

With Reload translation, actual language "French" and reload "French"
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Traceback (most recent call last):
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/netsvc.py", line 223, in dispatch
    result = LocalService(service_name)(method, *params)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/netsvc.py", line 74, in __call__
    return getattr(self, method)(*params)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/service/web_services.py", line 486, in execute
    return self._execute(db, uid, wiz_id, datas, action, context)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/service/web_services.py", line 466, in _execute
    return wiz.execute(db, uid, self.wiz_datas[wiz_id], action, context)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/wizard/__init__.py", line 177, in execute
    res = self.execute_cr(cr, uid, data, state, context)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/wizard/__init__.py", line 73, in execute_cr
    action_res = action(self, cr, uid, data, context)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/addons/base/module/wizard/wizard_module_lang_install.py", line 54, in _lang_install
    modobj.update_translations(cr, uid, mids, lang)
  File "/home/kryskool/openerp50-rc3/openerp/server/bin/addons/base/module/module.py", line 462, in update_translations
    f = os.path.join(addons.get_module_path(mod.name), 'i18n', lang + '.po')
  File "/usr/lib/python2.5/posixpath.py", line 62, in join
    elif path == '' or path.endswith('/'):
AttributeError: 'bool' object has no attribute 'endswith'
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With "English" as default language, and load "French" language
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Traceback (most recent call last):
  File "/home/oerp/openerp/5.0/server/bin/netsvc.py", line 421, in run
    result_from_method = method(*msg[2:])
  File "/home/oerp/openerp/5.0/server/bin/service/web_services.py", line 486, in execute
    return self._execute(db, uid, wiz_id, datas, action, context)
  File "/home/oerp/openerp/5.0/server/bin/service/web_services.py", line 466, in _execute
    return wiz.execute(db, uid, self.wiz_datas[wiz_id], action, context)
  File "/home/oerp/openerp/5.0/server/bin/wizard/__init__.py", line 177, in execute
    res = self.execute_cr(cr, uid, data, state, context)
  File "/home/oerp/openerp/5.0/server/bin/wizard/__init__.py", line 73, in execute_cr
    action_res = action(self, cr, uid, data, context)
  File "/home/oerp/openerp/5.0/server/bin/addons/base/module/wizard/wizard_module_lang_install.py", line 54, in _lang_install
    modobj.update_translations(cr, uid, mids, lang)
  File "/home/oerp/openerp/5.0/server/bin/addons/base/module/module.py", line 465, in update_translations
    tools.trans_load(cr.dbname, f, lang, verbose=False)
  File "/home/oerp/openerp/5.0/server/bin/tools/translate.py", line 502, in trans_load
    r = trans_load_data(db_name, fileobj, fileformat, lang, strict=strict, verbose=verbose)
  File "/home/oerp/openerp/5.0/server/bin/tools/translate.py", line 618, in trans_load_data
    trans_obj.write(cr, uid, ids, {'value': dic['value']})
  File "/home/oerp/openerp/5.0/server/bin/osv/orm.py", line 2205, in write
    'where id in ('+ids_str+')', upd1)
  File "/home/oerp/openerp/5.0/server/bin/sql_db.py", line 76, in wrapper
    return f(self, *args, **kwargs)
  File "/home/oerp/openerp/5.0/server/bin/sql_db.py", line 114, in execute
    res = self._obj.execute(query, params)
ProgrammingError: n'a pas pu sérialiser un accès à cause d'une mise à jour en parallèle
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Regards,