To show translation you should edit the wp-config file to define the lang, you should find
* WordPress Localized Language, defaults to English.
* Change this to localize WordPress. A corresponding MO file for the chosen
* language must be installed to wp-content/languages. For example, install
* de_DE.mo to wp-content/languages and set WPLANG to ‘de_DE’ to enable German
* language support.
add the language to the line shown above, to change to spanish.
define (‘WPLANG’ ‘es_ES’);
This would change the lang to Spanish only, you could use one of the different translation plugins to show more than one language. Circle Flip is compatible with WPML for example.
If you don’t get your lang changed after defining the wp lang, please contact your server admin and ask them to change the server locale to your desired lang.
Hope this helps, Regards.