function ra_change_translate_text_multiple( $translated )
 {     $text = array(      
                'eski1' => 'yeni1',        
                'eski2' => 'yeni2',        
                'eski3' => 'yeni3',    
          );    
          $translated = str_ireplace(  array_keys($text),  $text,  $translated );    
          return $translated;
}
add_filter( 'gettext', 'ra_change_translate_text_multiple', 20 );