Minimal website using multiple languages plugin

This is used for exercise. Based on https://github.com/kurtsson/jekyll-multiple-languages-plugin

Features:

• Internationalization of the website
• Per-post translation link
• Permalinks demo
• Pagination demo

Notes:

• The website is based on Flex theme.
• It does not work with GitHub pages because the I18N plugin is not in the main Jekyll repository and is not considered "safe".