Full French translation of Solidres

I have a problem with string calls in Expérience plugin. Look at the screenshot when language debugging is enabled (circled in red). It is obviously missing strings, but they are dads the language files fr-FR, after control.
It's an installation on a Joomla! new and clean, I also have the same problem on a jomla! with a site already done.
I do not understand ?
I can give you FTP and admin access if you want or give me a track to solve it?
Thank you.

UP please !
Best regards

Another problems with widget translation. Missing strings, but somes aren't call by the core code too. See screenshots in attachement + last update with missing string in language file at the file end...
Waiting yours anwers about the last problems...
Best regards

Hi,

Regarding translation errors, please raise a new support ticket and provide us your website info, we will check it for you.

Regards,

Here are 2.9.0 core BO/FO updated translations. Cancel and replace the previous ones.

Best regards

Here are 2.9.0 - 40 plugins updated translations. Cancel and replace the previous ones.

Best regards