1. Go to http://codex.wordpress.org/WordPress_in_Your_Language and select your language from the list, and download the file to your hard disk.
2. Once it is unzipped, open your FTP Manager and select on the server where you installed the WordPress files, the folder ‘wp-content’.
3. Under the folder ‘wp-content’ create a subfolder named ‘languages’.
4. In your FTP Manager, on the harddisk browser, go to the place where you have unzipped the language file.
5. Select the file with extension ‘.mo’ and upload it to the folder wp-content/languages/
6. Finally, open the wp-config.php file, and go to line 17 (define (‘WPLANG’, ”);), and enter between the ‘ ‘ your language code. For Spanish from Spain that would be es_ES.
7. Save the wp-config.php file and upload it to the server.
8. And that is it. Well done. You have just installed WordPress in the language of your choice.

If you have any question, comment or feedback, feel free to use this post’s comment form.

Have a great and excellent day.

Coach Erwin