Look for the gear or wrench icon. In the Russian main menu, this section is usually the last option on the right. The Russian word for "Settings" is "Настройки" .
If your version already includes English files, you can switch them within the game menus: Launch PES 2017 and reach the . Navigate to EXTRAS (the last tab on the right). pes 2017 language change russian to english
"Sider" is a modular tool used by the modding community to inject all kinds of content into PES 2017. Look for the gear or wrench icon