Hi Jean,
Garden support multi layout and languages, just install the language for joomla and set it as default.
Tutorial: https://www.joomla-monster.com/documentation/joomla-tutorials/how-to-install-and-configure-your-language-for-joomla-3 or this https://docs.joomla.org/J3.x:Setup_a_Multilingual_Site/Installing_New_Language
Thank you
