Where do you see the message about the nesting level?
There is no complete 3.6 translation for French yet, so you will see English text where the translation is missing. The French translation will be made available here when it is ready (this depends on volunteer translators): http://ez.no/community/translations
well I have tried but it doesn't seems to change anything... I replaced the ts file with the 3.5 file and the ini file also but nothing seems to change (I have cleared the cache...)