q-Translate remove 302 redirect. Need to overwrite qtranslate_core.php

qtranslate_core.php

<?php
$target = apply_filters( 'qtranslate_language_detect_redirect', $url_lang, $url_orig, $url_info );
if ( $target !== false && $target != $url_orig ) {
    //Custom code Start
    $urlToArray = explode('/', $url_orig); 
    if(end($urlToArray) != "")
    {
        $target .= '/';
    }
    //Custom code End
    wp_redirect( $target , 301);
    nocache_headers(); // prevent browser from caching redirection
    exit();
} else {
    // neutral path
    $url_info['doredirect'] .= ' - cancelled, because it goes to the same target - neutral URL';
    if ( $pagenow == 'index.php' && $q_config['url_mode'] == QTX_URL_PATH ) {
        $_SERVER['REQUEST_URI'] = trailingslashit( $url_info['path-base'] ) . $lang . $url_info['wp-path']; // should not hurt?
    }
}