Hello @sebastienrenaudeau,
I spotted the missing translation for “review”/”reviews” (in the summary section at the top) and added this to the next version. This will be available quite soon.
The Setup -> Google Credentials… Language refers to collecting data from Google only. I should clarify this and/or apply this same language to the collected review text. This is useful because it replaces your browser/OS’s language declaration when you’re viewing the reviews in Google.
@chris-kns has been working on a French translation. I’ll approve this once the plugin is ready to accept this.
In the meantime, I will add a shortcode parameter for this called review_word (like More and the date formatting/relative date).
[reviews_rating more="Plus" review_word="critique/commentaires"]
The second parameter will be added to version 1.29.
Version 1.29 is available and will fulfill the review/reviews word override functionality.