The french providers are not sending the full EIT EPG on there channels, they used a proprietary solution for there EPG information.
So by defaut you only have the now/next EPG guide displayed and the description is often missing.
So to have a propre EPG on the french channel you need to install the plugin EPGimport (enigma2-plugin-extensions-epgimport) by default it will install the Rytec source.
Once installed go into and select the source France XMLTV and there select the France -XXXX packages.
You will then have the full EPG on the french channels.