the first line of my source code when displaying it in a web browser is
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
I need lang to be "es_ES" (apply to any other language) and I have correctly conifgured my wp-config.php (es_ES)".
What do I have to change in order to have this?? Which is the file to modify??
Thanks and regards!