Check fr (Français) locale and fix typos

Check locales by native and fix typos.

Project use [jekyll-multiple-languages-plugin](https://github.com/kurtsson/jekyll-multiple-languages-plugin). Each locale file are keeped in `_18n` folder.
For example `en` is located in `_18n/en.yml` file.

Project was translated by translation service not by human. So it can keep typos.

Need to check current issue language.

- Fork
- Create branch 174_fr_locale
- Commit and create PR

Start by locating the French locale file under `_18n`, following the example `_18n/en.yml`, and review its current French text for typographical errors. Update only the French locale, then verify the locale remains valid and create the requested `174_fr_locale` branch and pull request.

Written by the indexing model from the issue text.