Hi @vaka2vaka
IF I select Russian as language Русский and cross check the Audit logs filter events for successful login works.
https://snipboard.io/Pz92M5.jpg
Do you have any other language translation plugin installed? Can you please cross check and try disable below settings if any enabled, mostly on of below settings is an issue with other plugins.
1) Deny bad query string – WP Security > Firewall > PHP rules tab. Deny bad query strings: uncheck the checkbox and save
2) Advanced char filter – WP Security > Firewall > PHP rules tab. Enable advanced character string filter :uncheck the checkbox and save
3) 5g firewall rules – WP Security > Firewall > 6G Blacklist firewall rules tab. Enable legacy 5G firewall protection uncheck the checkbox and save
4) 6g firewall rules – WP Security > Firewall > 6G Blacklist firewall rules tab. Enable 6G firewall rules – uncheck the checkbox and save
Regards