You are able to configure your marketplace to support multiple languages, so that you are able to accommodate users from all over the world. Adding a new language is simple, but will also require that you translate most of the default copy on your site.
this guide for more information on working with translations and adding new languages.
Once you have added a new language be sure to check 'Enable Language Selector'
There will be a drop down in the footer of your homepage that allows your users to select from a list of all languages that you have added. This way, if a user visits the English version of your site but needs to use another language, they can use this simple dropdown to select the correct language to display.
To add this dropdown to a different page, simply place the following in any liquid view: