add_action before theme setup

setup_theme run on init theme, before after_setup_theme.

The follow order on frontend, was fired in my test:

  1. load_textdomain
  2. plugins_loaded
  3. auth_cookie_valid
  4. set_current_user
  5. sanitize_comment_cookies
  6. setup_theme
  7. after_setup_theme
  8. init