add_filter(  'gettext',  'wps_translate_words_array'  );
add_filter(  'ngettext',  'wps_translate_words_array'  );
function wps_translate_words_array( $translated ) {
 
     $words = array(
            // 'word to translate' = > 'translation'
            'Yootheme' => 'Website Pro',
            );
 
     $translated = str_ireplace(  array_keys($words),  $words,  $translated );
     return $translated;
}