title: Setting Wordpress language programmatically?
body: <p>I have a user based website with Wordpress and from their profile settings they are able to select the language, this info and other settings are set for every user in user_meta.</p>
  
  <p>I know how to translate but, is there a way to set the theme language programmatically?</p>
  
  <p>Thank you!</p>
  
  <p>Edit: No plugins please, I need to do this as simple as possible.</p>