majo_wordpress on "[Plugin: WordPress Google Form] Cannot show WP GF settings - error 500"

I added your code to wp-config. I have WordPress still in English. This is part of my actual wp-config:

/**
 * For developers: WordPress debugging mode.
 *
 * Change this to true to enable the display of notices during development.
 * It is strongly recommended that plugin and theme developers use WP_DEBUG
 * in their development environments.
 */
define('WP_DEBUG', true); // or false
if (WP_DEBUG) {
    define('WP_DEBUG_LOG', true);
    ini_set('display_errors', 'on');
    error_reporting(E_STRICT | E_ALL);
    define('SAVEQUERIES', true);
    define('SCRIPT_DEBUG', true);
    error_log('Debug On!') ;
} 

/* That's all, stop editing! Happy blogging. */

I replicate error but the debug.log file is not created in the wp-content directory. What is wrong?