Может тут есть русские?Есть ли русификатор на данную игру?

I would suggest that you post questions in Russian overe there:

https://www.gog.com/forum/general_ru#1474457422

The chance is higher that you will get a meaningful reply ;)

You hit the English forum

But if you do understand English:

https://www.gog.com/forum/disciples_series#1468176936

this is the disciples sub forum

Maybe this is the right thread to ask about the Russian language: what does "hospoti pomiloi" mean, or does it mean anything?

I recall reading it´as a kid in some Finnish comedy cartoon called "Pahkasika" ("Warthog"), I presume it was supposed to be Russian.

It should be Hospodi (or Gospodi) pomiluj - Lord, have mercy

https://en.wikipedia.org/wiki/Kyrie

It clearly says:
Mother, tit eats python? Eats a pycnometer, he always derpy?