[ticket/9970] Rename validate_language() to validate_language_iso_name().

PHPBB3-9970

phpBB/includes/ucp/ucp_prefs.php

@@ -65,7 +65,7 @@ class ucp_prefs
 
 					$error = validate_data($data, array(
 						'dateformat'	=> array('string', false, 1, 30),
-						'lang'			=> array('language'),
+						'lang'			=> array('language_iso_name'),
 						'tz'			=> array('num', false, -14, 14),
 					));