Unfortunately no, this is not possible to make a multilingual site without a plugin, for a multilingual site, you have to use WPML or Polylang plugin, and then it will allow on your site to choose the language via a language switcher.
If you only want to translate and use your site in any single language then you can without a plugin as well, you will find the language files here: https://www.8theme.com/glotpress/projects/xstore/
