You can change the admin panel language at any time and at any stage: both during website creation and in the future.
The admin panel language is set in the configuration file (rk-config.php), which is located in the root directory of your website on the server.
To change the language, find the line:
define('RK_ADMIN_LANG', 'ru_RU');
And rеplace the value in the second parameter.
Russian version:
define('RK_ADMIN_LANG', 'ru_RU');
English:
define('RK_ADMIN_LANG', 'en_US');
Ukrainian:
define('RK_ADMIN_LANG', 'uk_UA');
Spanish:
define('RK_ADMIN_LANG', 'es_ES');