From my end I did the following:
1. Installed latest CB 2.0.8 on your site
2. Upgraded all Professional add-ons to latest CB 2.0.8 compatible versions based on this matrix:
www.joomlapolis.com/cb-20-addon-status
3. Installed latest CB 2.0.8 compatible french language plugin for you
Please note:
1. CB Groupjive is not yet fully cb 2.0 compatible but the installed version still works
2. CB Activity will have a new release very soon
3. CB Captcha has been discontinued and replaced by CB Antispam (upgraded it for you)
Also you need to find and reinstall the following not joomlapolis provided CB plugins:
1. AcyMailing CB Plugin
2. jdonation
3. CB JComments