Actually, Loco Translate uses to translate a site. You can’t build a multilingual website using Loco Translate. It only uses for translating a WP website to another language.
It is too easy to use Loco Translate. You just need to install it through the following path:
Dashboard > Plugins > Add New > Search for Loco Translate
Install it and then start translating your site. All the visible words that are used in your website, either belong to Vitrine or Woocommerce. So, if you translate the words of these two, you can translate the whole of the website.
You can find Woocommerce pre-ready translation files here and Vitrine translation files here. (if you can’t find a pre-ready file for your language, you have to translate your site manually. Also, you can report it to us and we will prepare it for your language as soon as possible)