To change language, generally we use plugin called ‘WPML’ but for changing language of just few texts then we just function called `get_text()’. Please visit the given link & try to use it:http://codex.wordpress.org/Plugin_API/Filter_Reference/gettext
For example to change ‘Name’ text to ‘First Name’
add_filter( ‘gettext’, ‘theme_change_comment_field_names’, 20, 3 );
function theme_change_comment_field_names( $translated_text, $text, $domain ) {switch ( $translated_text ) {
case ‘Name’ :
$translated_text = __( ‘First Name’, ‘theme_text_domain’ );
break;
}
return $translated_text;
}