Some strings in frontend lack Russian translation.

1. ????????? -> ???? ???? -> "Create host"
2. ????????? -> ?????? IT -> root -> "Add Service"
3. ????????? -> ?????? IT -> root -> Add Service -> ????? -> ???????? -> "Incorrect service start time." error message not translated.
4. ?????? -> ????????????? ?????? -> ???????? -> ???????? -> "????: Page received incorrect data", "Warning: Incorrect value for field "??????" error messages not translated.