I added the Spanish plugin to a Spanish-speaking client's blog and also changed the necessary code to define('WPLANG', 'es_ES'); However, it only changes some of her WP management pages to Spanish, not all.
Any suggestions? Do I need to adjust any settings?
How does the plugin option compare to simply installing the full WP Spanish version? Can I still use the custom theme (which I coded in English). I only worked with the style.css file.