Hi, you can contribute to the French translation in the following WordPress link.
Or you can use the following plugin Loco Translate to translate the strings into French in your site.
Another option is to use Poedit.
If you like you can also share your French po and mo files to us. It would be our pleasure to add these files in the next release.
Kind regards
In the upcoming plugin version there will be free addon called “Custom Messages”. You can install it and change the text you’re referring to as you like.