error i18n FR

Hi jmau, thanks for pointing this out we added a translation suggestion.

I think everyone, evenyourself can also do that, just take a look at the information here: https://make.www.ads-software.com/polyglots/

And the translations for the plugin, as well as those for the upcoming version to be releases next week can be found and edited here: https://translate.www.ads-software.com/projects/wp-plugins/tiny-compress-images

We are not a French editor, so we only added the translation suggestion.