Drupal Internationalization (i18n) and hreflang for Multilingual SEO
Often multilingual sites will use URLs contructed with non-compliant country region codes. When using Drupal and i18n / Internationalization, this can be a problem since i18n_hreflang relies on the language codes as set (manually) within Drupal by the webmaster. In such situations it could be preferable to resolve this with code rather than changing the URL pattern.