Hi,
Thanks for your feedback.
I've made a patch which should make it so that the indexes are not in "all" language when the website is multilingual and "all" otherwise.
It should fix the last problem you're talking about.
Here is attached a new version of the smart search plugin install package so that you can test. You'll have to delete and reindex after the installation.
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Regarding the other issue with the description in english for french, I'm not sure what is going on and I'm not able to reproduce. Could you provide a backend and a FTP access in order to look into it ?