Steps to reproduce:

1. Navigate URL: https://www.zabbix.com/documentation/3.4/ru/manual/acknowledges
2. Scroll down to "Просмотр"
3. Find text "будет отображаться количество проблем на ПАНЕЛЕ"
4. "ПАНЕЛЕ" should be changed to "ПАНЕЛИ"

Result:
See screenshot...
See log file...
See memory dump...
Expected:
See screenshot....
See attached patch file...